WEBVTT 00:00:00.000 --> 00:00:02.000 Welcome back to the Deep Dive, where we take 00:00:02.000 --> 00:00:04.660 your stack of sources, articles, research notes, 00:00:04.780 --> 00:00:06.960 and we plunge into the material to pull out the 00:00:06.960 --> 00:00:09.779 essential knowledge and insights you need. Today, 00:00:09.900 --> 00:00:13.699 we are undertaking a monumental task. We're mapping 00:00:13.699 --> 00:00:16.579 the literal abyss. Not just mapping it. We're 00:00:16.579 --> 00:00:18.640 trying to fundamentally rethink what that abyss 00:00:18.640 --> 00:00:20.579 means for the planet right beneath our feet. 00:00:21.059 --> 00:00:23.539 Our focus today is on Marie Tharp, an American 00:00:23.539 --> 00:00:27.429 geologist and... cartographer whose work didn't 00:00:27.429 --> 00:00:29.550 just chart the bottom of the sea. No, it did 00:00:29.550 --> 00:00:32.369 so much more. It provided the visual, the physical 00:00:32.369 --> 00:00:35.070 proof that forced the entire field of earth science 00:00:35.070 --> 00:00:38.909 to embrace continental drift and, well, eventually 00:00:38.909 --> 00:00:41.429 the theory of plate tectonics. Okay, let's unpack 00:00:41.429 --> 00:00:43.109 this and set our mission for this deep dive. 00:00:43.390 --> 00:00:45.250 We're looking at a really powerful narrative 00:00:45.250 --> 00:00:48.229 here. It's Tharp's life, her difficult path in 00:00:48.229 --> 00:00:50.609 a field that, let's be honest, actively excluded 00:00:50.609 --> 00:00:53.570 her. Absolutely. And the outcome is almost unbelievable. 00:00:54.299 --> 00:00:56.579 a cartographer who was often barred from even 00:00:56.579 --> 00:00:59.240 stepping onto a research ship used meticulous 00:00:59.240 --> 00:01:02.399 grueling data plotting to reveal a massive hidden 00:01:02.399 --> 00:01:05.000 feature that completely changed our model of 00:01:05.000 --> 00:01:07.840 the planet the classic story It really is. It's 00:01:07.840 --> 00:01:11.099 a story of persistence and of data just overcoming 00:01:11.099 --> 00:01:14.019 generations of scientific dogma. It truly is 00:01:14.019 --> 00:01:16.099 a remarkable story especially when you consider 00:01:16.099 --> 00:01:18.879 the context. I mean to really grasp the significance 00:01:18.879 --> 00:01:21.780 of her work we have to recognize the sheer scale 00:01:21.780 --> 00:01:26.609 of the The geographical ignorance. The ignorance 00:01:26.609 --> 00:01:29.209 surrounding the ocean floor. Yes. Before the 00:01:29.209 --> 00:01:32.209 1950s. Well, we had some general ideas. You know, 00:01:32.230 --> 00:01:34.390 the vast majority of the seabed was a complete 00:01:34.390 --> 00:01:36.950 topographical mystery, a blank slate. Right. 00:01:37.030 --> 00:01:39.590 So Tharp's discovery, which focused on the mid 00:01:39.590 --> 00:01:42.109 -Atlantic ridge, it wasn't just a curiosity. 00:01:42.230 --> 00:01:45.109 It was the critical, undeniable physical evidence. 00:01:45.349 --> 00:01:47.969 It was the smoking gun. The smoking gun that 00:01:47.969 --> 00:01:50.430 the more abstract theories like plate tectonics 00:01:50.430 --> 00:01:53.180 had lacked for decades. Precisely. Without our 00:01:53.180 --> 00:01:55.120 map, that theory might have just remained on 00:01:55.120 --> 00:01:57.319 the fringes for much, much longer. Let's dive 00:01:57.319 --> 00:01:59.260 right into the source material then. We should 00:01:59.260 --> 00:02:01.219 probably start at the beginning of this truly 00:02:01.219 --> 00:02:04.120 unconventional path. Marie Tharp, born July 30, 00:02:04.340 --> 00:02:07.299 1920, in Ypsilanti, Michigan. The source material 00:02:07.299 --> 00:02:09.759 immediately points to the origin of her map -making 00:02:09.759 --> 00:02:12.099 roots, and it came directly through her father. 00:02:12.319 --> 00:02:14.780 That foundation was built by William Edgar Tharp. 00:02:15.129 --> 00:02:17.610 He worked as a soil surveyor for the United States 00:02:17.610 --> 00:02:19.990 Department of Agriculture. And soil surveying, 00:02:19.990 --> 00:02:21.710 that's not just digging in the dirt. We have 00:02:21.710 --> 00:02:23.729 to be clear about what that job entailed back 00:02:23.729 --> 00:02:27.129 then. Oh, not at all. It is, in essence, incredibly 00:02:27.129 --> 00:02:30.009 detailed mapmaking. But for agricultural purposes, 00:02:30.289 --> 00:02:34.349 it requires immense precision in grading, classification, 00:02:34.569 --> 00:02:37.189 and mapping all the features of the land. It's 00:02:37.189 --> 00:02:40.159 rigorous cartography. Absolutely. And crucially, 00:02:40.259 --> 00:02:42.759 Marie often accompanied him on his fieldwork. 00:02:42.879 --> 00:02:45.300 So this wasn't just a casual hobby or hearing 00:02:45.300 --> 00:02:46.939 about it at the dinner table. No, this was a 00:02:46.939 --> 00:02:49.819 direct hands -on introduction to mapmaking and 00:02:49.819 --> 00:02:52.560 survey work from a very, very young age. She 00:02:52.560 --> 00:02:54.340 was basically an apprentice to a professional 00:02:54.340 --> 00:02:56.900 cartographer. But here we hit that early 20th 00:02:56.900 --> 00:02:59.139 century paradox, that contradiction the sources 00:02:59.139 --> 00:03:02.099 point out. Yeah. Despite being exposed to the 00:03:02.099 --> 00:03:04.680 rigorous fieldwork and the technical skill it 00:03:04.680 --> 00:03:07.580 required, she initially saw the physical act 00:03:07.580 --> 00:03:11.400 of surveying and exploration as explicitly men's 00:03:11.400 --> 00:03:13.759 work. So she understood the technique, but she 00:03:13.759 --> 00:03:16.860 couldn't see herself in that role. Exactly. The 00:03:16.860 --> 00:03:19.199 sources make it really clear she didn't internalize 00:03:19.199 --> 00:03:21.560 it as a viable professional path for herself. 00:03:22.000 --> 00:03:24.800 It just shows you how deeply entrenched those 00:03:24.800 --> 00:03:27.680 societal limitations were, even when the talent 00:03:27.680 --> 00:03:30.330 and the interest were clearly there. That initial 00:03:30.330 --> 00:03:32.409 acceptance of limitation, it makes her later 00:03:32.409 --> 00:03:34.569 career, where she just redefined the limits of 00:03:34.569 --> 00:03:38.669 her field, so much more powerful. Her childhood, 00:03:38.669 --> 00:03:40.689 though, was highly unusual, and it was because 00:03:40.689 --> 00:03:43.370 of her father's job. Right. He was nomadic. Very. 00:03:43.689 --> 00:03:46.949 Due to the nature of a USDA soil surveyor's job, 00:03:47.169 --> 00:03:49.150 moving to map different areas of the country, 00:03:49.349 --> 00:03:52.210 the family moved constantly until William Tharp 00:03:52.210 --> 00:03:54.780 retired in 1931. And we're talking about attending 00:03:54.780 --> 00:03:58.719 over 17 public schools. 17 across states like 00:03:58.719 --> 00:04:02.180 Alabama, Iowa, Michigan, Indiana. I mean, I can't 00:04:02.180 --> 00:04:03.800 even imagine the challenge of that. Attending 00:04:03.800 --> 00:04:06.159 17 schools means every single year you are the 00:04:06.159 --> 00:04:07.879 new kid. You're starting over socially, trying 00:04:07.879 --> 00:04:09.860 to catch up with different curricula. It sounds 00:04:09.860 --> 00:04:12.219 like a childhood just defined by impermanence. 00:04:12.300 --> 00:04:14.680 It really does. And it highlights a powerful 00:04:14.680 --> 00:04:17.779 theme in her life. Her environment was constantly 00:04:17.779 --> 00:04:21.639 shifting, but her academic pursuit. Her curiosity, 00:04:21.660 --> 00:04:24.259 that became her source of stability. The sources 00:04:24.259 --> 00:04:27.279 point to one year in particular. Yes, one full 00:04:27.279 --> 00:04:30.339 school year in Florence, Alabama, seems to have 00:04:30.339 --> 00:04:32.959 been particularly influential. She attended a 00:04:32.959 --> 00:04:34.959 class called Current Science. Current Science. 00:04:35.220 --> 00:04:36.540 Yeah, and in it she learned about contemporary 00:04:36.540 --> 00:04:39.819 research and living scientists. This focus on 00:04:39.819 --> 00:04:42.160 current active discovery seems to have really 00:04:42.160 --> 00:04:44.480 cemented her curiosity and gave her an anchor 00:04:44.480 --> 00:04:47.350 in that constantly moving world. So she graduates 00:04:47.350 --> 00:04:49.649 high school in Bella Fontaine, Ohio, where the 00:04:49.649 --> 00:04:52.550 family finally put down roots. But even then, 00:04:52.569 --> 00:04:54.329 she didn't just jump straight into a science 00:04:54.329 --> 00:04:56.569 career. No, not at all. She spent a couple of 00:04:56.569 --> 00:04:58.589 years working on the family farm before she entered 00:04:58.589 --> 00:05:02.230 Ohio University in 1939. And famously, she changed 00:05:02.230 --> 00:05:04.670 her major constantly. She was exploring. She 00:05:04.670 --> 00:05:06.410 was definitely exploring. She eventually graduated 00:05:06.410 --> 00:05:11.930 in 1943 with degrees in, get this, English and 00:05:11.930 --> 00:05:14.990 music. English and music plus four minors, none 00:05:14.990 --> 00:05:17.410 of which scream future oceanographic revolutionary. 00:05:17.889 --> 00:05:20.110 Not even a little bit. The fact that she was 00:05:20.110 --> 00:05:22.389 so intellectually curious across such diverse 00:05:22.389 --> 00:05:26.449 fields is telling. But the real career pivot, 00:05:26.569 --> 00:05:28.949 the thing that pushed her towards science, was 00:05:28.949 --> 00:05:31.970 imposed by global circumstances. That pivot, 00:05:32.009 --> 00:05:34.649 of course, was World War II. It created this 00:05:34.649 --> 00:05:37.889 massive temporary professional vacuum in a lot 00:05:37.889 --> 00:05:40.980 of specialized technical fields. Precisely. Before 00:05:40.980 --> 00:05:43.439 the war, professions like petroleum geology were 00:05:43.439 --> 00:05:46.490 almost entirely restricted to men. But once the 00:05:46.490 --> 00:05:49.050 young men left for military service, American 00:05:49.050 --> 00:05:51.310 universities scrambled to fill their classrooms. 00:05:51.550 --> 00:05:53.810 Right. They had to maintain funding and output, 00:05:53.949 --> 00:05:56.209 particularly in fields that were crucial to the 00:05:56.209 --> 00:05:58.670 war effort. Like geology for finding oil and 00:05:58.670 --> 00:06:01.149 other strategic resources. And Tharp seized that 00:06:01.149 --> 00:06:04.029 exact window of opportunity. The University of 00:06:04.029 --> 00:06:06.110 Michigan, which had previously barred women from 00:06:06.110 --> 00:06:08.709 its geology program, suddenly opened its doors. 00:06:08.990 --> 00:06:11.529 Tharp enrolled in the petroleum geology program 00:06:11.529 --> 00:06:14.279 there in Ann Arbor. And she earned her master's 00:06:14.279 --> 00:06:18.480 degree in 1944. And it's really hard to overstate 00:06:18.480 --> 00:06:20.839 how significant this was. Let's put it in context. 00:06:21.079 --> 00:06:23.500 Our source material notes that at the time, fewer 00:06:23.500 --> 00:06:26.040 than 4 % of all earth science doctorates were 00:06:26.040 --> 00:06:28.439 obtained by women. This wasn't just a change 00:06:28.439 --> 00:06:31.339 of major for her. It was breaking a major institutional 00:06:31.339 --> 00:06:34.420 barrier, even if that barrier was only temporarily 00:06:34.420 --> 00:06:37.310 lowered because of the war. It's a perfect example 00:06:37.310 --> 00:06:40.449 of a societal crisis creating an unexpected and, 00:06:40.529 --> 00:06:43.389 frankly, a necessary opportunity. However, those 00:06:43.389 --> 00:06:45.870 barriers immediately reformed once she entered 00:06:45.870 --> 00:06:47.629 the professional world. Well, they snapped right 00:06:47.629 --> 00:06:50.170 back into place. Her first job was as a junior 00:06:50.170 --> 00:06:52.870 geologist at the Staniland Oil Company in Tulsa, 00:06:52.870 --> 00:06:55.089 Oklahoma. And even with a master's degree in 00:06:55.089 --> 00:06:58.149 the field. She had the credentials, but the rules 00:06:58.149 --> 00:07:01.250 remained rigid. The Staniland Oil Company absolutely 00:07:01.250 --> 00:07:04.069 did not permit women to attend or conduct field 00:07:04.069 --> 00:07:06.899 work. Period. Her role was restricted entirely 00:07:06.899 --> 00:07:09.540 to coordinating maps and processing data that 00:07:09.540 --> 00:07:11.379 her male colleagues collected out in the field. 00:07:11.519 --> 00:07:13.560 So she was more than qualified to do the primary 00:07:13.560 --> 00:07:16.180 research, but she was relegated to being this 00:07:16.180 --> 00:07:20.379 high -level organizer and desk jockey. Yes. But 00:07:20.379 --> 00:07:23.079 this constraint, this limitation, it actually 00:07:23.079 --> 00:07:26.279 led to her next brilliant move. Rather than letting 00:07:26.279 --> 00:07:29.540 it define her career, she decided to expand her 00:07:29.540 --> 00:07:32.610 toolbox. How so? She concurrently enrolled in 00:07:32.610 --> 00:07:34.350 the University of Tulsa's mathematics program 00:07:34.350 --> 00:07:36.810 and obtained a second bachelor of science degree. 00:07:37.050 --> 00:07:39.410 That's the real strategic genius right there. 00:07:39.550 --> 00:07:41.629 If they wouldn't let her do geology in the field, 00:07:41.709 --> 00:07:43.689 she decided she was going to become completely 00:07:43.689 --> 00:07:46.490 unbeatable at the geometry, the cartography, 00:07:46.629 --> 00:07:49.170 and the pure data analysis back in the office. 00:07:49.449 --> 00:07:52.170 And that rigorous training in mathematics proved 00:07:52.170 --> 00:07:55.689 absolutely essential for what was to come. Bathymetry, 00:07:55.850 --> 00:07:57.829 the measurement of ocean depth, is inherently 00:07:57.829 --> 00:07:59.980 mathematical. It's all numbers. All numbers. 00:08:00.120 --> 00:08:02.339 It involves complex conversions, corrections 00:08:02.339 --> 00:08:05.060 for water temperature, and salinity triangulation. 00:08:05.420 --> 00:08:08.079 By mastering the quantitative side, she built 00:08:08.079 --> 00:08:10.459 the analytical engine that allowed her to synthesize 00:08:10.459 --> 00:08:12.980 these massive, messy data sets, and it prepared 00:08:12.980 --> 00:08:15.120 her for the revolutionary work to come. Okay, 00:08:15.199 --> 00:08:17.819 so after four years in Tulsa, Tharp moves to 00:08:17.819 --> 00:08:20.779 New York City in 1948. She's looking for new 00:08:20.779 --> 00:08:23.160 professional territory, and this eventually leads 00:08:23.160 --> 00:08:26.250 her to Columbia University. That's right. She 00:08:26.250 --> 00:08:28.430 found drafting work at the newly established 00:08:28.430 --> 00:08:32.750 Lamont Geological Observatory, or LGO. This was 00:08:32.750 --> 00:08:35.370 a place founded by the highly ambitious and, 00:08:35.450 --> 00:08:38.070 frankly, very competitive Maurice Ewing. And 00:08:38.070 --> 00:08:40.429 LGO was a powerhouse, right? Oh, yeah. It was 00:08:40.429 --> 00:08:43.509 a powerhouse of cutting -edge, government -funded 00:08:43.509 --> 00:08:46.149 deep -sea research. It was where all the action 00:08:46.149 --> 00:08:49.350 was, but it was also a fiercely masculine environment. 00:08:49.730 --> 00:08:52.429 And this leads to that fascinating biographical 00:08:52.429 --> 00:08:55.549 detail from the sources. When she interviewed 00:08:55.549 --> 00:08:58.029 for the drafting job, she strategically chose 00:08:58.029 --> 00:09:00.350 not to mention her master's degree in petroleum 00:09:00.350 --> 00:09:02.809 geology. It speaks volumes about the professional 00:09:02.809 --> 00:09:04.929 climate at the time, doesn't it? It really does. 00:09:05.110 --> 00:09:07.350 A master's degree might have immediately labeled 00:09:07.350 --> 00:09:10.529 her as overqualified for what they saw as technical 00:09:10.529 --> 00:09:12.750 support. Or worse, she might have been perceived 00:09:12.750 --> 00:09:14.789 as a direct challenge to the male scientists. 00:09:15.029 --> 00:09:17.009 So she played it smart. She likely understood 00:09:17.009 --> 00:09:20.129 that to get her foot in the door and start working 00:09:20.129 --> 00:09:22.409 with the real data, which is what she wanted. 00:09:22.549 --> 00:09:25.490 She needed to present herself as a skilled technical 00:09:25.490 --> 00:09:28.509 professional, not as a potential principal investigator. 00:09:28.909 --> 00:09:32.049 And it worked. She became one of the very first 00:09:32.049 --> 00:09:35.909 women working at LGO. It was there that she met 00:09:35.909 --> 00:09:38.429 the geologist Bruce Heason. who was a graduate 00:09:38.429 --> 00:09:40.990 student at the time, and he quickly recognized 00:09:40.990 --> 00:09:43.710 her unique skill set, which led to a professional 00:09:43.710 --> 00:09:46.129 partnership that would last for 30 years. Their 00:09:46.129 --> 00:09:48.409 initial projects were pretty pragmatic, very 00:09:48.409 --> 00:09:51.870 tied to the post -war context. Very. They were 00:09:51.870 --> 00:09:54.629 focusing on the Cold War. They used photographic 00:09:54.629 --> 00:09:57.409 data to map the deep ocean floor to locate things 00:09:57.409 --> 00:09:59.490 like downed military aircraft from World War 00:09:59.490 --> 00:10:02.269 II. And later on, mapping the paths of turbidity 00:10:02.269 --> 00:10:05.110 currents, which are essentially undersea landslides. 00:10:05.230 --> 00:10:07.519 Right. But she eventually started working for 00:10:07.519 --> 00:10:10.600 Heisen exclusively, funneling all her geological 00:10:10.600 --> 00:10:12.759 knowledge and her advanced mathematical and drafting 00:10:12.759 --> 00:10:16.120 skills into one monumental and pretty thankless 00:10:16.120 --> 00:10:18.919 task. Plotting the vast, seemingly featureless 00:10:18.919 --> 00:10:21.480 topography of the ocean floor. And here we have 00:10:21.480 --> 00:10:23.960 to reemphasize the gender divide. It's so central 00:10:23.960 --> 00:10:26.320 to the story. For the first 18 years of their 00:10:26.320 --> 00:10:28.919 critical collaboration, Heisen was out on the 00:10:28.919 --> 00:10:32.159 research ship. the VEMA, collecting the raw bathymetric 00:10:32.159 --> 00:10:34.899 data with echo sounders. While Tharp was confined 00:10:34.899 --> 00:10:37.220 to the lab in New York. Meticulously drawing 00:10:37.220 --> 00:10:40.559 maps from the data he literally mailed back to 00:10:40.559 --> 00:10:43.539 her. She was the cartographic genius behind the 00:10:43.539 --> 00:10:46.440 operation, yet she was literally barred from 00:10:46.440 --> 00:10:48.580 the place she was mapping. She couldn't verify 00:10:48.580 --> 00:10:50.820 the instruments. She couldn't observe the conditions. 00:10:50.980 --> 00:10:53.519 She couldn't participate in the physical collection 00:10:53.519 --> 00:10:56.340 of the very data she was analyzing. It's astounding. 00:10:56.480 --> 00:11:00.120 And it wasn't until 1968 on the USNS Kane that 00:11:00.120 --> 00:11:02.440 she finally participated in a data collection 00:11:02.440 --> 00:11:06.039 cruise 18 years later. But that confinement, 00:11:06.120 --> 00:11:08.820 that restriction, it forced her into a synthetic 00:11:08.820 --> 00:11:11.240 role that was ultimately her greatest advantage. 00:11:11.500 --> 00:11:13.799 How do you mean? Well, while Heason was focused 00:11:13.799 --> 00:11:16.659 on the specific, often messy, day -to -day collection 00:11:16.659 --> 00:11:19.480 process out at sea, Tharp was forced to look 00:11:19.480 --> 00:11:22.500 at the macro picture back in the lab. She independently 00:11:22.500 --> 00:11:25.350 synthesized multiple data streams. Right. It 00:11:25.350 --> 00:11:27.789 wasn't just Heason's data. No. She was pulling 00:11:27.789 --> 00:11:30.250 in Heason's soundings, older data from the Woods 00:11:30.250 --> 00:11:32.789 Hole, oceanographic institutions ship Atlantis, 00:11:32.889 --> 00:11:35.490 and even seismographic data from undersea earthquakes. 00:11:35.809 --> 00:11:38.129 That cross -referencing process, that synthesis, 00:11:38.529 --> 00:11:40.549 that's where the real magic happens. But it must 00:11:40.549 --> 00:11:42.029 have been an absolute nightmare of complexity. 00:11:42.429 --> 00:11:44.629 Oh, just imagine the technical challenge. They 00:11:44.629 --> 00:11:47.409 were using 1950s technology. We're talking single 00:11:47.409 --> 00:11:50.120 -beam echo sounders. So the ship sends a single 00:11:50.120 --> 00:11:52.840 ping straight down. Straight down. It waits for 00:11:52.840 --> 00:11:55.120 the echo and measures the depth based on the 00:11:55.120 --> 00:11:58.500 travel time. But this process was so prone to 00:11:58.500 --> 00:12:01.120 error. Why is that? Sound velocity changes with 00:12:01.120 --> 00:12:03.919 water temperature, with pressure, with salinity. 00:12:03.980 --> 00:12:06.480 The early systems had to be calibrated constantly. 00:12:07.069 --> 00:12:09.769 And even more fundamentally, without modern GPS, 00:12:10.169 --> 00:12:13.350 navigation was crude. Ah, so you might not even 00:12:13.350 --> 00:12:15.269 know exactly where the ship is when it takes 00:12:15.269 --> 00:12:17.570 the measurement. Exactly. A slight error in the 00:12:17.570 --> 00:12:20.230 ship's plotted position could mean miles of error 00:12:20.230 --> 00:12:22.549 on the final map. And she had to reconcile data 00:12:22.549 --> 00:12:25.470 taken over a 30 -year span by different ships 00:12:25.470 --> 00:12:27.669 using different calibration methods and often 00:12:27.669 --> 00:12:29.850 with these just very sparse lines of travel. 00:12:29.950 --> 00:12:31.490 It's not like they were mowing the lawn out there. 00:12:31.629 --> 00:12:33.779 Not at all. So she wasn't just plotting a few 00:12:33.779 --> 00:12:37.019 lines. She was taking these sporadic, often inconsistent 00:12:37.019 --> 00:12:41.019 slices of information and interpolating a smooth, 00:12:41.259 --> 00:12:44.039 logical, three -dimensional topographical map 00:12:44.039 --> 00:12:46.500 of a surface she had never even seen. This was 00:12:46.500 --> 00:12:49.379 the first systematic attempt to map the entire 00:12:49.379 --> 00:12:53.240 ocean floor. The very first. And it demanded 00:12:53.240 --> 00:12:55.639 the precision of a mathematician combined with 00:12:55.639 --> 00:12:58.710 the spatial intuition of a geologist. She had 00:12:58.710 --> 00:13:01.049 to believe implicitly in the consistency of the 00:13:01.049 --> 00:13:04.009 data, even when it seemed contradictory, because 00:13:04.009 --> 00:13:05.669 she knew the map wouldn't lie if it was plotted 00:13:05.669 --> 00:13:08.289 correctly. This sounds like the absolute epitome 00:13:08.289 --> 00:13:11.070 of forensic science, but applied to geology. 00:13:11.549 --> 00:13:14.289 Using these tiny fragments of information to 00:13:14.289 --> 00:13:18.909 reconstruct a massive, complex truth. Okay, let's 00:13:18.909 --> 00:13:21.830 turn to the core discovery. Before the 1950s, 00:13:21.830 --> 00:13:23.950 the geology community had been wrestling with 00:13:23.950 --> 00:13:26.610 the question of the Earth's structure. We knew 00:13:26.610 --> 00:13:28.929 how to map mountains and valleys on land. But 00:13:28.929 --> 00:13:31.090 without any real knowledge of the seafloor, any 00:13:31.090 --> 00:13:33.389 theory about how the Earth moved was just incomplete 00:13:33.389 --> 00:13:36.169 speculation. It was a huge blind spot. A geological 00:13:36.169 --> 00:13:38.570 vacuum. And theories of Earth's structure were 00:13:38.570 --> 00:13:41.049 just stalled. Geologists knew there was a mountain 00:13:41.049 --> 00:13:42.529 range running down the middle of the Atlantic, 00:13:42.710 --> 00:13:46.190 the Mid -Atlantic Ridge, or MAR, but they didn't 00:13:46.190 --> 00:13:48.490 know its true shape or its function. And mapping 00:13:48.490 --> 00:13:51.269 it was essential to answering that bigger planetary 00:13:51.269 --> 00:13:54.070 question of global evolution. Farb's breakthrough 00:13:54.070 --> 00:13:57.129 happened around 1952. She was aligning profiles, 00:13:57.549 --> 00:14:00.370 those cross sections of depth data, primarily 00:14:00.370 --> 00:14:03.009 from the Atlantis cruises and one very early 00:14:03.009 --> 00:14:06.490 profile from a naval ship, the Stuart. She generated 00:14:06.490 --> 00:14:09.470 approximately six detailed profiles stretching 00:14:09.470 --> 00:14:12.850 west to east across the North Atlantic. And she 00:14:12.850 --> 00:14:15.070 was focusing specifically on the central axis 00:14:15.070 --> 00:14:17.509 of that known mountain range. And this required 00:14:17.509 --> 00:14:21.559 a just an immense amount of manual labor. calculating 00:14:21.559 --> 00:14:24.279 depths, correcting positions, drawing these continuous 00:14:24.279 --> 00:14:27.279 smooth lines all by hand. Painstaking work. Yeah. 00:14:27.399 --> 00:14:29.399 And it was in that painstaking repetitive labor 00:14:29.399 --> 00:14:32.039 that she spotted the anomaly, the aha moment. 00:14:32.279 --> 00:14:33.960 So what did she see? What jumped out from the 00:14:33.960 --> 00:14:36.240 data? She identified an aligned, continuous, 00:14:36.440 --> 00:14:39.519 deep V -shaped structure that ran exactly down 00:14:39.519 --> 00:14:41.279 the center line of the mid -Atlantic ridge axis. 00:14:41.419 --> 00:14:43.139 This wasn't just a valley. It had a very distinct 00:14:43.139 --> 00:14:46.210 morphology. A V -shape? Yes, and she immediately 00:14:46.210 --> 00:14:48.669 hypothesized that this V -shape was a rift valley, 00:14:48.809 --> 00:14:51.809 a massive crack where the oceanic surface was 00:14:51.809 --> 00:14:54.409 actively being pulled apart. Wait, okay, so why 00:14:54.409 --> 00:14:57.610 is a V -shaped crack so different from a regular 00:14:57.610 --> 00:15:00.850 canyon or a valley? Why did that specific shape 00:15:00.850 --> 00:15:04.450 scream tectonic action to her? Well, a standard 00:15:04.450 --> 00:15:07.190 valley, like a river valley, is often formed 00:15:07.190 --> 00:15:09.950 by erosion. or sometimes by folding of the crust. 00:15:10.409 --> 00:15:13.929 A V -shaped rift running continuously for thousands 00:15:13.929 --> 00:15:16.129 of miles along the highest point of a mountain 00:15:16.129 --> 00:15:18.210 range. The very spine of the mountain range. 00:15:18.250 --> 00:15:20.950 That suggests a tensile force. It suggests the 00:15:20.950 --> 00:15:23.509 crust is being stretched and split open. If you 00:15:23.509 --> 00:15:26.090 see a crack running down the spine of a massive 00:15:26.090 --> 00:15:28.730 underwater mountain range, it implies a fundamental 00:15:28.730 --> 00:15:31.669 weakness, a place where new material is rising 00:15:31.669 --> 00:15:33.789 from below and pushing the sides apart. This 00:15:33.789 --> 00:15:36.429 was direct evidence of seafloor spreading. The 00:15:36.429 --> 00:15:39.529 first real physical evidence. And that idea, 00:15:39.549 --> 00:15:41.730 seafloor spreading, was the critical missing 00:15:41.730 --> 00:15:44.309 piece for the theory of continental drift, which 00:15:44.309 --> 00:15:46.049 at the time was still considered pseudoscience 00:15:46.049 --> 00:15:48.409 by many mainstream geologists. A fringe theory. 00:15:48.629 --> 00:15:50.840 Absolutely. Continental drift, originally proposed 00:15:50.840 --> 00:15:53.279 by Alfred Wiegener, suggested continents move 00:15:53.279 --> 00:15:56.120 laterally across the globe. But the mechanism, 00:15:56.360 --> 00:15:58.580 the engine driving that movement, was completely 00:15:58.580 --> 00:16:01.519 missing. And Tharp's Rish Valley provided that 00:16:01.519 --> 00:16:04.799 engine. It did. Magma rising from the mantle 00:16:04.799 --> 00:16:07.539 at the rift, creating new crust and pushing the 00:16:07.539 --> 00:16:09.580 older crust away on either side. It was beautiful. 00:16:09.639 --> 00:16:12.419 It was elegant. But the immediate reaction, even 00:16:12.419 --> 00:16:15.279 from her own partner, Bruce Heason, was one of 00:16:15.279 --> 00:16:18.600 profound skepticism. If not... you know, outright 00:16:18.600 --> 00:16:21.259 rejection. Heason was highly uncomfortable with 00:16:21.259 --> 00:16:23.799 the finding. The discovery of a central rift 00:16:23.799 --> 00:16:25.899 valley was just too strong a piece of evidence 00:16:25.899 --> 00:16:29.659 for continental drift, a theory he and much of 00:16:29.659 --> 00:16:32.000 the geological establishment publicly rejected. 00:16:32.259 --> 00:16:35.120 And at the time, Heason publicly favored a different 00:16:35.120 --> 00:16:37.720 hypothesis instead. That's right. The expanding 00:16:37.720 --> 00:16:39.860 Earth hypothesis. We need to explain that because 00:16:39.860 --> 00:16:42.399 it's central to understanding why he was so quick 00:16:42.399 --> 00:16:45.159 to dismiss her finding. Why would Heason prefer 00:16:45.159 --> 00:16:48.139 expanding Earth? Well, the expanding Earth model 00:16:48.139 --> 00:16:50.340 essentially posits that the planet is slowly 00:16:50.340 --> 00:16:53.419 inflating, kind of like a balloon. Okay. As the 00:16:53.419 --> 00:16:55.820 planet expands, the crust stretches and cracks, 00:16:56.019 --> 00:16:58.720 creating new ocean floor. This model explains 00:16:58.720 --> 00:17:00.820 why the continents are separating. They're just 00:17:00.820 --> 00:17:03.100 riding outward on an expanding globe without 00:17:03.100 --> 00:17:05.619 requiring a really complicated mechanism like 00:17:05.619 --> 00:17:08.579 subduction. And subduction is where old ocean 00:17:08.579 --> 00:17:10.660 floor has to be destroyed somewhere else, right? 00:17:10.740 --> 00:17:14.319 Pushed back down into the mantle. Exactly. Geologists 00:17:14.319 --> 00:17:16.680 in the 50s had a lot of trouble finding evidence 00:17:16.680 --> 00:17:19.440 of subduction, so the expanding Earth hypothesis 00:17:19.440 --> 00:17:22.259 seemed simpler to some. It was a cleaner explanation, 00:17:22.599 --> 00:17:24.960 even if it had its own massive problems like 00:17:24.960 --> 00:17:27.980 where all the new mass was coming from. So, Tharp's 00:17:27.980 --> 00:17:30.180 discovery of a rift actually fit both theories 00:17:30.180 --> 00:17:33.099 in a way, but the expanding Earth model avoided 00:17:33.099 --> 00:17:35.700 that messy problem of continent collision and 00:17:35.700 --> 00:17:38.500 sinking crust. Correct. And because refining 00:17:38.500 --> 00:17:40.839 was so radical, and because it challenged the 00:17:40.839 --> 00:17:43.440 prevailing static view of the Earth, he isn't 00:17:43.440 --> 00:17:45.680 defaulted to the easiest possible dismissal he 00:17:45.680 --> 00:17:47.660 could find. And this is the moment documented 00:17:47.660 --> 00:17:50.940 in our sources. The infamous quote. He famously 00:17:50.940 --> 00:17:53.839 dismissed Tharp's explanation as girl talk. That 00:17:53.839 --> 00:17:56.799 phrase, girl talk, it just perfectly encapsulates 00:17:56.799 --> 00:17:59.259 the systemic resistance she was up against. It 00:17:59.259 --> 00:18:01.140 wasn't just a scientific disagreement. No, it 00:18:01.140 --> 00:18:04.220 was a rejection based on gender. It was a refusal 00:18:04.220 --> 00:18:06.359 to believe that someone without the pedigree 00:18:06.359 --> 00:18:09.079 of fieldwork, and specifically a woman, could 00:18:09.079 --> 00:18:12.039 identify a mechanism that upended decades of 00:18:12.039 --> 00:18:14.940 geological consensus. But Tharp had the data, 00:18:15.059 --> 00:18:17.559 and she maintained confidence in her plotting. 00:18:17.839 --> 00:18:20.940 She did. But to move past that dismissal, she 00:18:20.940 --> 00:18:23.460 knew she needed independent, objective, secondary 00:18:23.460 --> 00:18:26.119 verification. And that verification came through 00:18:26.119 --> 00:18:28.920 pure serendipity via another researcher's project. 00:18:29.160 --> 00:18:31.460 And ironically, it was a project that Heason 00:18:31.460 --> 00:18:34.240 himself commissioned. Right. Heason had a colleague, 00:18:34.440 --> 00:18:37.619 Howard Foster, plot ocean earthquake epicenters. 00:18:37.700 --> 00:18:40.759 But for a completely unrelated project, he was 00:18:40.759 --> 00:18:43.400 trying to link turbidity currents to quake zones. 00:18:43.779 --> 00:18:46.140 So he had no idea he was commissioning the very 00:18:46.140 --> 00:18:48.279 data that would prove him wrong. None at all. 00:18:48.680 --> 00:18:51.359 That earthquake epicenter map became the invaluable 00:18:51.359 --> 00:18:54.240 secondary data set. When Tharp got her hands 00:18:54.240 --> 00:18:56.400 on it and overlaid Foster's map of earthquake 00:18:56.400 --> 00:18:59.059 locations onto her meticulously drawn profile 00:18:59.059 --> 00:19:01.700 of the mid -Atlantic ridge rift valley. The alignment 00:19:01.700 --> 00:19:04.359 was perfect. It was instantaneous and just terrifyingly 00:19:04.359 --> 00:19:05.900 perfect. The earthquakes were happening right 00:19:05.900 --> 00:19:08.640 along the axis of her proposed rift valley. Not 00:19:08.640 --> 00:19:11.490 near it. Not around it. In it. The V -shaped 00:19:11.490 --> 00:19:13.170 valley was not just some historical feature. 00:19:13.250 --> 00:19:16.250 It was an active geological boundary. Seismicity 00:19:16.250 --> 00:19:18.869 indicates movement, fracture, energy release. 00:19:19.029 --> 00:19:22.329 It's proof of activity. Exactly. The fact that 00:19:22.329 --> 00:19:24.890 the world's mid -ocean earthquakes occurred precisely 00:19:24.890 --> 00:19:28.269 along the line she had drawn confirmed that this 00:19:28.269 --> 00:19:31.369 was a zone of ongoing active crustal separation. 00:19:31.869 --> 00:19:34.069 It turned an interesting geographical feature 00:19:34.069 --> 00:19:36.730 into the dynamic engine of continental drift. 00:19:37.390 --> 00:19:40.309 So that dual evidence, the topographical structure 00:19:40.309 --> 00:19:42.670 plus the seismic proof of movement, that was 00:19:42.670 --> 00:19:44.329 the pivot point. That was the point of no return. 00:19:44.490 --> 00:19:47.809 It forced Heason to abandon his expanding Earth 00:19:47.809 --> 00:19:50.910 hypothesis to accept Thup's rift valley and to 00:19:50.910 --> 00:19:53.230 finally pivot to supporting plate tectonics. 00:19:53.450 --> 00:19:55.750 And it's such a powerful demonstration of how 00:19:55.750 --> 00:19:57.809 science advances, isn't it? It wasn't just a 00:19:57.809 --> 00:20:00.450 single data stream. No, it was the interdisciplinary 00:20:00.450 --> 00:20:03.089 connection between bathymetry and seismology 00:20:03.089 --> 00:20:05.490 that ultimately forced the consensus to shift. 00:20:05.609 --> 00:20:07.579 And it was Tharp that... the person doing the 00:20:07.579 --> 00:20:10.480 tedious manual plotting in the office who connected 00:20:10.480 --> 00:20:13.680 those dots. So once that initial seismic breakthrough 00:20:13.680 --> 00:20:15.920 is accepted, the work had to expand immediately. 00:20:16.140 --> 00:20:18.240 Because if this mechanism was real, it couldn't 00:20:18.240 --> 00:20:20.000 be a local phenomenon. It couldn't be just in 00:20:20.000 --> 00:20:23.279 the North Atlantic. Exactly. Tharp and her team 00:20:23.279 --> 00:20:25.980 of graduate assistants began to plot global data. 00:20:26.519 --> 00:20:29.019 They systematically demonstrated that the Rift 00:20:29.019 --> 00:20:32.420 Valley structure continued south along the entire 00:20:32.420 --> 00:20:34.940 length of the Mid -Atlantic Ridge. right into 00:20:34.940 --> 00:20:37.480 the South Atlantic. And then the true global 00:20:37.480 --> 00:20:40.299 implications started to emerge. Yes, because 00:20:40.299 --> 00:20:42.519 she then found similar valley structures in the 00:20:42.519 --> 00:20:45.099 Indian Ocean, the Arabian Sea, the Red Sea, and 00:20:45.099 --> 00:20:47.339 the Gulf of Aden. She didn't just find a mountain 00:20:47.339 --> 00:20:51.240 range. She found a continuous 40 ,000 -mile -long 00:20:51.240 --> 00:20:54.640 global scar that wrapped around the entire planet 00:20:54.640 --> 00:20:57.819 like the seam on a baseball. This global network 00:20:57.819 --> 00:21:00.779 solidified the paradigm shift. You could no longer 00:21:00.779 --> 00:21:03.220 dismiss the Mid -Atlantic Ridge as some localized 00:21:03.220 --> 00:21:06.660 anomaly. Tharp had physically mapped the existence 00:21:06.660 --> 00:21:09.920 of a global oceanic rift zone. And this was the 00:21:09.920 --> 00:21:12.700 definitive, large -scale, physical evidence supporting 00:21:12.700 --> 00:21:14.579 the theory that the seafloor was continuously 00:21:14.579 --> 00:21:16.839 being created and spreading outward. It became 00:21:16.839 --> 00:21:18.920 the absolute centerpiece of the modern plate 00:21:18.920 --> 00:21:21.000 tectonics theory. But even as she was proving 00:21:21.000 --> 00:21:23.859 the Earth's dynamic movement, her work ran headlong 00:21:23.859 --> 00:21:25.940 into a completely different kind of obstacle. 00:21:27.000 --> 00:21:29.319 Geopolitics. The Cold War. This is one of the 00:21:29.319 --> 00:21:32.440 most fascinating and, frankly, frustrating footnotes 00:21:32.440 --> 00:21:36.039 in science history. The U .S. government forbade 00:21:36.039 --> 00:21:39.140 the publication of detailed, technically precise 00:21:39.140 --> 00:21:42.640 topographic seafloor maps. Why? What was the 00:21:42.640 --> 00:21:45.160 specific fear there? They feel that Soviet submarines 00:21:45.160 --> 00:21:47.940 would use the highly accurate bathymetry, the 00:21:47.940 --> 00:21:50.660 depths and shapes of trenches, ridges, and underwater 00:21:50.660 --> 00:21:54.160 canyons, for tactical purposes. Ah, for hiding. 00:21:54.259 --> 00:21:56.940 For hiding, for navigation, for avoiding detection. 00:21:57.869 --> 00:22:00.569 In the tense climate of the late 1950s, the U 00:22:00.569 --> 00:22:02.890 .S. Navy considered this detailed cartography 00:22:02.890 --> 00:22:05.490 a matter of national security. It was classified. 00:22:05.769 --> 00:22:08.450 So here they are, holding the definitive proof 00:22:08.450 --> 00:22:10.509 of the most important geological theory of the 00:22:10.509 --> 00:22:12.990 century, and the government essentially classifies 00:22:12.990 --> 00:22:15.630 their data. How did they possibly get their information 00:22:15.630 --> 00:22:18.029 out into the world? They employed a brilliant, 00:22:18.190 --> 00:22:20.950 almost artistic circumvention. They couldn't 00:22:20.950 --> 00:22:23.829 publish maps based on strict contour lines, which 00:22:23.829 --> 00:22:25.869 would provide the precise numerical data the 00:22:25.869 --> 00:22:28.450 Navy was afraid of. So what did they do? Tharp 00:22:28.450 --> 00:22:31.049 and Heason decided to draw their maps in a physiographic 00:22:31.049 --> 00:22:33.289 style. Let's take a moment to explain what that 00:22:33.289 --> 00:22:35.150 means for our listeners, because it's really 00:22:35.150 --> 00:22:37.730 key to their workaround. Physiographic mapping 00:22:37.730 --> 00:22:40.549 treats the topography more like a landscape painting. 00:22:41.210 --> 00:22:43.789 Instead of relying purely on contour lines and 00:22:43.789 --> 00:22:46.890 numerical depths, they used shaded relief. color 00:22:46.890 --> 00:22:49.490 gradients, and an oblique perspective. So it's 00:22:49.490 --> 00:22:51.609 like the water was drained and you're viewing 00:22:51.609 --> 00:22:54.410 the landscape from an airplane. Exactly. This 00:22:54.410 --> 00:22:57.049 gave a powerful, immediate visual impression 00:22:57.049 --> 00:23:00.970 of the mountains, the valleys, the rifts. But 00:23:00.970 --> 00:23:03.250 it lacked the specific, measurable precision 00:23:03.250 --> 00:23:05.799 that a submarine would need for navigation. It 00:23:05.799 --> 00:23:08.019 was a beautiful and effective act of scientific 00:23:08.019 --> 00:23:11.160 defiance. It really was. They conveyed the vast 00:23:11.160 --> 00:23:13.460 reality of the discovery, including the Rift 00:23:13.460 --> 00:23:15.920 Valley, without providing the Soviets with the 00:23:15.920 --> 00:23:18.559 technically precise data set. They published 00:23:18.559 --> 00:23:20.859 their first physiographic map of the North Atlantic 00:23:20.859 --> 00:23:24.119 in 1957. So they essentially converted classified 00:23:24.119 --> 00:23:27.039 scientific data into publicly accessible art. 00:23:27.279 --> 00:23:30.299 And in doing so, they satisfied both the demands 00:23:30.299 --> 00:23:32.559 of science and the constraints of the military 00:23:32.559 --> 00:23:35.349 censors. The public could see the rift, they 00:23:35.349 --> 00:23:37.529 could understand the dynamics, but the specific 00:23:37.529 --> 00:23:40.349 navigational numbers remained obscured. Unfortunately, 00:23:40.650 --> 00:23:42.549 while the science found its way into the public 00:23:42.549 --> 00:23:44.769 domain, the recognition for the scientist who 00:23:44.769 --> 00:23:48.750 created it was severely lacking. We have to discuss 00:23:48.750 --> 00:23:50.930 the credit disparity that followed this breakthrough. 00:23:51.289 --> 00:23:53.869 Tharp's pivotal role was consistently overlooked 00:23:53.869 --> 00:23:56.890 in that initial wave of recognition. While he's 00:23:56.890 --> 00:23:58.789 in and others published the major papers about 00:23:58.789 --> 00:24:02.230 plate tectonics, the papers between 1959 and 00:24:02.230 --> 00:24:05.529 1963 that truly brought the concept into the 00:24:05.529 --> 00:24:08.039 mainstream. Thop's name wasn't on them. Her name 00:24:08.039 --> 00:24:10.400 did not appear on them. That is just staggering. 00:24:10.539 --> 00:24:12.920 The person who physically located and defined 00:24:12.920 --> 00:24:16.140 the key mechanism of the entire theory was excluded 00:24:16.140 --> 00:24:18.559 from the seminal papers that confirmed it. How 00:24:18.559 --> 00:24:21.079 could the scientific community justify that omission? 00:24:21.259 --> 00:24:23.900 Well, at the time, drafting and cartography were 00:24:23.900 --> 00:24:26.640 widely viewed as technical support roles, not 00:24:26.640 --> 00:24:28.890 as fundamental scientific contribution. Even 00:24:28.890 --> 00:24:30.369 though she was synthesizing and interpreting 00:24:30.369 --> 00:24:33.630 the data, not just tracing lines. Exactly. Her 00:24:33.630 --> 00:24:36.109 immense intellectual contribution was systematically 00:24:36.109 --> 00:24:39.029 relegated to the status of mere technical assistance. 00:24:39.250 --> 00:24:41.849 The culture reserved authorship for the lead 00:24:41.849 --> 00:24:44.250 investigators and those involved in the physical 00:24:44.250 --> 00:24:46.230 field work. And the institutional resistance 00:24:46.230 --> 00:24:48.759 at Lamont didn't stop there. The sources talk 00:24:48.759 --> 00:24:51.660 about major workplace drama that erupted in 1964 00:24:51.660 --> 00:24:54.779 with the director, Maurice Ewing. Ewing was a 00:24:54.779 --> 00:24:58.759 powerful and often ruthless figure. He and Heason 00:24:58.759 --> 00:25:00.619 had a professional disagreement over competing 00:25:00.619 --> 00:25:03.680 theories and research focus, and Ewing cut off 00:25:03.680 --> 00:25:06.539 Heason's access to all Lamont data. And as a 00:25:06.539 --> 00:25:09.200 direct consequence of this falling out with Heason, 00:25:09.420 --> 00:25:11.900 Ewing subsequently fired Maurice Hart. Fired 00:25:11.900 --> 00:25:14.200 her. So she was thrown out of the very institution 00:25:14.200 --> 00:25:16.180 that her work had fundamentally transformed. 00:25:16.220 --> 00:25:18.839 She lost her physical office, access to the main 00:25:18.839 --> 00:25:21.660 data archives. It was a shocking move that just 00:25:21.660 --> 00:25:23.640 showed the political volatility of high -level 00:25:23.640 --> 00:25:26.700 science. But Tharp was relentless. She didn't 00:25:26.700 --> 00:25:28.880 stop working. She continued from home. She did. 00:25:29.259 --> 00:25:31.920 Heason, recognizing how irreplaceable she was, 00:25:32.119 --> 00:25:34.400 managed to continue paying her from home using 00:25:34.400 --> 00:25:36.759 contracts he secured from the Navy. The same 00:25:36.759 --> 00:25:38.759 organization that had initially restricted her 00:25:38.759 --> 00:25:41.519 publication. The very same. So she continued 00:25:41.519 --> 00:25:44.039 the monumental task of global mapping, but now 00:25:44.039 --> 00:25:46.140 outside the confines of the established laboratory. 00:25:46.420 --> 00:25:49.099 And that decade of persistent, independent work 00:25:49.099 --> 00:25:51.279 eventually culminated in the visual masterpiece 00:25:51.279 --> 00:25:53.519 that introduced plate tectonics to the general 00:25:53.519 --> 00:25:56.460 public. Yes, the collaboration with the Austrian 00:25:56.460 --> 00:26:00.420 landscape painter Heinrich Buran. Buran was a 00:26:00.420 --> 00:26:02.579 master of that physiographic technique. And together, 00:26:02.680 --> 00:26:05.400 Tharp... Heason and Buran realized the complete 00:26:05.400 --> 00:26:08.640 map of the entire ocean floor, merging scientific 00:26:08.640 --> 00:26:11.319 accuracy with breathtaking visual impact. And 00:26:11.319 --> 00:26:14.579 that iconic map, the world ocean floor, was published 00:26:14.579 --> 00:26:18.539 by National Geographic in 1977. It finally provided 00:26:18.539 --> 00:26:21.500 a detailed, comprehensive, and beautiful visual 00:26:21.500 --> 00:26:24.039 confirmation of the dynamic nature of our planet 00:26:24.039 --> 00:26:26.579 to millions of ordinary people around the globe. 00:26:26.740 --> 00:26:29.180 It was really the crowning achievement of their 00:26:29.180 --> 00:26:31.349 partnership. Following the publication of that 00:26:31.349 --> 00:26:33.410 map, and then tragically after Heason's death 00:26:33.410 --> 00:26:36.390 in 1977, Marie Tharp remained on the faculty 00:26:36.390 --> 00:26:39.670 at Columbia until 1983. But her engagement with 00:26:39.670 --> 00:26:42.210 maps, it didn't end with her retirement. No, 00:26:42.250 --> 00:26:45.109 not at all. She transitioned her expertise into 00:26:45.109 --> 00:26:47.250 running a map distribution business in South 00:26:47.250 --> 00:26:49.970 Nyack, ensuring that both scientific and public 00:26:49.970 --> 00:26:53.430 audiences had access to these critical cartographic 00:26:53.430 --> 00:26:56.009 works. She never stopped being a cartographer. 00:26:56.230 --> 00:26:58.369 And she also ensured that the raw intellectual 00:26:58.369 --> 00:27:00.910 labor of her career would be preserved for future 00:27:00.910 --> 00:27:04.789 study. In 1995, she donated her comprehensive 00:27:04.789 --> 00:27:07.690 map collection, all her notes, the detailed profiles 00:27:07.690 --> 00:27:10.609 to the Map and Geography Division at the Library 00:27:10.609 --> 00:27:13.990 of Congress. That donation is so key because 00:27:13.990 --> 00:27:16.490 it allows researchers today to trace her meticulous 00:27:16.490 --> 00:27:19.400 methodology. It's an intellectual goldmine. It 00:27:19.400 --> 00:27:21.640 shows how she reconciled those sparse, messy 00:27:21.640 --> 00:27:25.099 soundings into a coherent planetary map. It cements 00:27:25.099 --> 00:27:27.519 her position not just as a discoverer, but as 00:27:27.519 --> 00:27:30.400 a methodological pioneer. Now, for many of our 00:27:30.400 --> 00:27:32.660 listeners, the delay in recognition for historical 00:27:32.660 --> 00:27:35.059 figures, especially for women in science, is 00:27:35.059 --> 00:27:37.039 probably the most frustrating part of these stories. 00:27:37.619 --> 00:27:40.240 Tharp received her major honors much, much later 00:27:40.240 --> 00:27:42.990 in life. That's often the case, isn't it? It 00:27:42.990 --> 00:27:45.230 takes time for the impact of a paradigm shift 00:27:45.230 --> 00:27:48.309 to fully sink in. And it takes even longer for 00:27:48.309 --> 00:27:50.470 the institution to recognize the individuals 00:27:50.470 --> 00:27:53.329 who face that internal resistance. So what were 00:27:53.329 --> 00:27:55.589 some of those awards? Well, she received the 00:27:55.589 --> 00:27:57.690 National Geographic Society's Hubbard Medal in 00:27:57.690 --> 00:28:01.150 1978, which was a major honor. But subsequent 00:28:01.150 --> 00:28:04.470 awards came decades later. The Society of Women 00:28:04.470 --> 00:28:06.829 Geographers Outstanding Achievement Award was 00:28:06.829 --> 00:28:10.809 in 1996. The Mary Sears Woman Pioneer in Oceanography 00:28:10.809 --> 00:28:13.789 Award was in 1999. And the ultimate institutional 00:28:13.789 --> 00:28:17.250 reconciliation must have been the Lamont Doherty 00:28:17.250 --> 00:28:20.349 Earth Observatory Heritage Award in 2001. Coming 00:28:20.349 --> 00:28:22.490 from the same institution that had unceremoniously 00:28:22.490 --> 00:28:25.670 fired her nearly four decades earlier. A long 00:28:25.670 --> 00:28:28.609 overdue recognition. A very long overdue recognition 00:28:28.609 --> 00:28:31.910 of her fundamental role in Lamont's legacy. But 00:28:31.910 --> 00:28:34.150 perhaps the most powerful and comprehensive honor 00:28:34.150 --> 00:28:37.329 came in 1997, when the Library of Congress recognized 00:28:37.329 --> 00:28:39.509 her as one of the four greatest cartographers 00:28:39.509 --> 00:28:41.589 of the 20th century. That's incredible company. 00:28:41.849 --> 00:28:44.089 It places her alongside giants like the model 00:28:44.089 --> 00:28:46.710 maker Erwin Reyes and the geographer Richard 00:28:46.710 --> 00:28:49.160 Eades Harrison. What's truly encouraging is that 00:28:49.160 --> 00:28:51.200 her legacy isn't just about looking backward 00:28:51.200 --> 00:28:54.099 at past achievements. It's actively shaping the 00:28:54.099 --> 00:28:56.319 future of science. That is the enduring influence 00:28:56.319 --> 00:28:58.819 of the Marie Tharp Fellowship, established by 00:28:58.819 --> 00:29:02.019 Lamont Doherty in 2004. This is a competitive 00:29:02.019 --> 00:29:05.339 academic visiting fellowship specifically created 00:29:05.339 --> 00:29:07.700 to support women researchers working in earth 00:29:07.700 --> 00:29:10.329 sciences at Columbia. And it provides significant 00:29:10.329 --> 00:29:12.970 financial aid, right? Something like $30 ,000 00:29:12.970 --> 00:29:16.130 for three months of research. It's directly enabling 00:29:16.130 --> 00:29:19.289 the next generation of women scientists to overcome 00:29:19.289 --> 00:29:22.009 the kind of institutional hurdles Tharper herself 00:29:22.009 --> 00:29:25.789 faced. It moves beyond just... symbolic recognition 00:29:25.789 --> 00:29:28.990 into tangible career building support. And her 00:29:28.990 --> 00:29:31.230 recognition has also just exploded in popular 00:29:31.230 --> 00:29:33.589 science media, which shows that the next generation 00:29:33.589 --> 00:29:36.930 knows her name not as a footnote, but as a primary 00:29:36.930 --> 00:29:39.309 driver of discovery. Oh, yeah. Her work is highly 00:29:39.309 --> 00:29:42.029 visible now. Google Earth, for instance, included 00:29:42.029 --> 00:29:44.589 the Marie Tharp historical map layer in 2009. 00:29:45.319 --> 00:29:47.539 Which means anyone with a smartphone can just 00:29:47.539 --> 00:29:49.720 scroll to the middle of the Atlantic and overlay 00:29:49.720 --> 00:29:52.839 the map she drew 60 years ago. It connects the 00:29:52.839 --> 00:29:55.240 historical process directly to modern mapping 00:29:55.240 --> 00:29:57.579 technology. She was also featured prominently 00:29:57.579 --> 00:30:00.400 in Neil deGrasse Tyson's Cosmos, a space time 00:30:00.400 --> 00:30:03.700 odyssey in 2014. Her character was animated and 00:30:03.700 --> 00:30:06.619 voiced by Amanda Seyfried. And that mass media 00:30:06.619 --> 00:30:09.099 feature, it really cemented her story as one 00:30:09.099 --> 00:30:11.380 of not just scientific achievement, but of overcoming 00:30:11.380 --> 00:30:14.559 bias. Tyson specifically highlighted how she 00:30:14.559 --> 00:30:17.240 overcame sexism to contribute fundamentally to 00:30:17.240 --> 00:30:19.819 her field. That shapes the public narrative about 00:30:19.819 --> 00:30:22.380 her legacy. And the honors continue to be global 00:30:22.380 --> 00:30:26.160 and, well, celestial. In 2015, the International 00:30:26.160 --> 00:30:28.960 Astronomical Union named a moon crater the Fart 00:30:28.960 --> 00:30:31.339 Moon Crater. in her honor. Mapping her influence 00:30:31.339 --> 00:30:33.740 onto another celestial body. But perhaps the 00:30:33.740 --> 00:30:35.640 most satisfying piece of posthumous recognition, 00:30:35.960 --> 00:30:38.420 for me at least, connects directly back to her 00:30:38.420 --> 00:30:41.680 early professional frustrations. In 2023, the 00:30:41.680 --> 00:30:44.119 U .S. Secretary of the Navy renamed a new survey 00:30:44.119 --> 00:30:47.480 ship the USNS Marie Tharp. From being barred 00:30:47.480 --> 00:30:49.720 from stepping foot on a Navy research vessel 00:30:49.720 --> 00:30:52.200 because she was a woman, to having a state -of 00:30:52.200 --> 00:30:54.319 -the -art Navy research vessel named after her 00:30:54.319 --> 00:30:56.559 in the 21st century. That transformation is the 00:30:56.559 --> 00:30:59.779 ultimate validation. It's an undeniable testament 00:30:59.779 --> 00:31:02.819 to the persistence of scientific truth. The story 00:31:02.819 --> 00:31:05.400 of Marie Tharp is so profound because she took 00:31:05.400 --> 00:31:09.859 lines of dry technical depth data, which to anyone 00:31:09.859 --> 00:31:12.019 else might have just looked like noise or error. 00:31:12.200 --> 00:31:15.220 And through meticulous effort, geometry and this 00:31:15.220 --> 00:31:18.319 unshakable belief in her plotting, she revealed 00:31:18.319 --> 00:31:21.980 mountains, trenches and a continuous global tear 00:31:21.980 --> 00:31:24.119 beneath the waves. She proved that the Earth 00:31:24.119 --> 00:31:27.579 is not a solid static object, but a dynamic system 00:31:27.579 --> 00:31:30.039 in constant agonizing motion. And she achieved 00:31:30.039 --> 00:31:33.099 this global planet. defining discovery from inside 00:31:33.099 --> 00:31:35.160 a drafting room without ever having collected 00:31:35.160 --> 00:31:37.539 the raw data herself. Her journey offers such 00:31:37.539 --> 00:31:39.599 a deep lesson, not only about persistence, but 00:31:39.599 --> 00:31:41.279 about critical thinking and scientific synergy. 00:31:41.460 --> 00:31:44.319 Her initial evidence, that bad metric map, was 00:31:44.319 --> 00:31:46.819 rejected by consensus science. Out of hand. It 00:31:46.819 --> 00:31:49.420 took combining that topographical map with the 00:31:49.420 --> 00:31:52.339 complementary, separate, and quantitative evidence 00:31:52.339 --> 00:31:55.680 of global seismology to force the establishment 00:31:55.680 --> 00:31:58.940 to listen. It demonstrates the undeniable power 00:31:58.940 --> 00:32:01.480 of interdisciplinary evidence when you're challenging 00:32:01.480 --> 00:32:06.559 conventional wisdom. Totally independent fields, 00:32:06.759 --> 00:32:09.359 geography, and earthquake physics, and they align 00:32:09.359 --> 00:32:11.559 perfectly. You have found truth. Absolutely. 00:32:12.039 --> 00:32:14.519 The next time you look at a stylized map of the 00:32:14.519 --> 00:32:16.859 world and see that central seam running down 00:32:16.859 --> 00:32:19.059 the middle of the ocean, that mid -Atlantic ridge, 00:32:19.220 --> 00:32:21.539 remember that it was once a blank, speculative 00:32:21.539 --> 00:32:24.519 space filled in by the meticulous, persistent 00:32:24.519 --> 00:32:27.299 work of a cartographer who was told her revolutionary 00:32:27.299 --> 00:32:30.539 insight was nothing more than girl talk. And 00:32:30.539 --> 00:32:32.400 that leads us to our final thought for you, the 00:32:32.400 --> 00:32:35.380 listener. to mull over. We discussed how Tharp's 00:32:35.380 --> 00:32:37.859 original detailed maps had to be rendered artistically, 00:32:37.960 --> 00:32:41.200 obscured from precise technical viewing to prevent 00:32:41.200 --> 00:32:43.259 the U .S. government from classifying them. Right. 00:32:43.380 --> 00:32:45.180 Out of fear that Soviet submarines would gain 00:32:45.180 --> 00:32:47.240 a navigational advantage, they literally hid 00:32:47.240 --> 00:32:50.079 geological truth for geopolitical reasons. So 00:32:50.079 --> 00:32:53.380 knowing that critical physical data was intentionally 00:32:53.380 --> 00:32:56.200 obfuscated or hidden during the Cold War due 00:32:56.200 --> 00:32:58.859 to military fears, how does that dynamic translate 00:32:58.859 --> 00:33:02.480 today? In a world of instant global data sharing, 00:33:02.890 --> 00:33:05.349 Consider what pieces of modern scientific information, 00:33:05.549 --> 00:33:07.869 perhaps related to deep sea resources or climate 00:33:07.869 --> 00:33:11.089 trends or critical geopolitical geology, might 00:33:11.089 --> 00:33:13.130 still be intentionally hidden from public view 00:33:13.130 --> 00:33:16.109 or publication today for similar reasons of national 00:33:16.109 --> 00:33:19.170 security or competitive global advantage. What 00:33:19.170 --> 00:33:21.069 important pieces of information might still be 00:33:21.069 --> 00:33:23.190 hidden from our view today, forcing scientists 00:33:23.190 --> 00:33:25.789 to rely on subtle circumventions just to share 00:33:25.789 --> 00:33:27.210 fundamental truths about our planet?