WEBVTT 00:00:00.000 --> 00:00:01.679 So I want you to take your phone out of your 00:00:01.679 --> 00:00:04.879 pocket for a second. Just look at the screen. 00:00:05.099 --> 00:00:08.099 Maybe you're sending a text or streaming a video 00:00:08.099 --> 00:00:10.380 or just checking the time. Right, something we 00:00:10.380 --> 00:00:13.320 all do 100 times a day. Exactly. And right now, 00:00:13.480 --> 00:00:14.960 just sitting there in the palm of your hand, 00:00:15.060 --> 00:00:19.859 you're relying on RGB color pixels, Wi -Fi, electromagnetic 00:00:19.859 --> 00:00:23.519 waves, and the thermodynamics keeping your battery 00:00:23.519 --> 00:00:26.199 from melting. It's a lot of tech in a very small 00:00:26.199 --> 00:00:28.719 package. It really is. And here is the crazy 00:00:28.719 --> 00:00:31.399 part. The underlying mathematics for literally 00:00:31.399 --> 00:00:34.479 all of those technologies were invented by one 00:00:34.479 --> 00:00:38.340 Scottish guy. And his classmates used to mockingly 00:00:38.340 --> 00:00:41.310 call him dafty. It's just incredible to think 00:00:41.310 --> 00:00:43.929 about, honestly, because it is entirely accurate 00:00:43.929 --> 00:00:45.909 to say that our modern technological infrastructure 00:00:45.909 --> 00:00:48.310 is built directly on top of his math. I mean, 00:00:48.469 --> 00:00:50.590 without him, the 20th century simply does not 00:00:50.590 --> 00:00:52.350 happen the way it did. Yeah, we wouldn't recognize 00:00:52.350 --> 00:00:55.729 it. So today's deep dive is sourced from a comprehensive 00:00:55.729 --> 00:00:59.189 Wikipedia article on James Clerk Maxwell. And 00:00:59.189 --> 00:01:02.009 our mission today isn't just to list off a bunch 00:01:02.009 --> 00:01:04.109 of old scientific discoveries. Right, that would 00:01:04.109 --> 00:01:07.109 be a bit dry. Yeah, exactly. The goal is to extract 00:01:07.109 --> 00:01:10.590 the aha moments from his life to help you understand 00:01:10.590 --> 00:01:14.129 not just what this genius discovered, but how 00:01:14.129 --> 00:01:18.030 his unique, relentlessly curious mind actually 00:01:18.280 --> 00:01:21.040 Operated. Okay, let's unpack this because we 00:01:21.040 --> 00:01:23.500 are talking about a man whose ideas completely 00:01:23.500 --> 00:01:25.640 rewired our understanding of reality itself. 00:01:25.739 --> 00:01:28.019 We really are. We're looking at the 19th century 00:01:28.019 --> 00:01:30.340 scientist who had the absolute greatest influence 00:01:30.340 --> 00:01:33.500 on 20th century physics. Wow. Yeah, what Maxwell 00:01:33.500 --> 00:01:35.799 achieved is widely considered the second great 00:01:35.799 --> 00:01:38.060 unification in physics. The first, of course, 00:01:38.180 --> 00:01:40.379 being realized by Isaac Newton. Right. Maxwell 00:01:40.379 --> 00:01:43.200 didn't just stumble onto new elements. He synthesized 00:01:43.200 --> 00:01:46.120 entire fields of seemingly unrelated phenomena 00:01:46.120 --> 00:01:49.310 into a single elegant framework. And to understand 00:01:49.310 --> 00:01:51.590 how he did that, we have to, you know, start 00:01:51.590 --> 00:01:54.109 at the beginning. In a setting that doesn't exactly 00:01:54.109 --> 00:01:57.090 scream theoretical physics. Not at all. He was 00:01:57.090 --> 00:01:59.750 born in 1831 in Edinburgh, Scotland, but he was 00:01:59.750 --> 00:02:02.430 raised out in the country, out on his family's 00:02:02.430 --> 00:02:05.969 massive 1 ,500 acre estate at Glen Lair. And 00:02:05.969 --> 00:02:08.669 from the absolute jump, this kid was insatiably 00:02:08.669 --> 00:02:11.810 curious. Like beyond normal toddler curiosity. 00:02:12.090 --> 00:02:15.419 Way beyond. By the age of three, he was roaming 00:02:15.419 --> 00:02:18.439 around the estate, investigating streams and 00:02:18.439 --> 00:02:21.680 bell wires, doors, locks. Anything that moved 00:02:21.680 --> 00:02:23.780 or made a noise prompted him to ask his parents 00:02:23.780 --> 00:02:26.300 his favorite catchphrase, which was, what's the 00:02:26.300 --> 00:02:29.680 go of that? I love that. Right. And if they gave 00:02:29.680 --> 00:02:32.240 him some vague, brushed -off answer, he wouldn't 00:02:32.240 --> 00:02:34.719 let it go. He would demand... Show me how it 00:02:34.719 --> 00:02:37.060 does. What's fascinating here is that even as 00:02:37.060 --> 00:02:39.520 a toddler, he wasn't just passively observing 00:02:39.520 --> 00:02:41.780 his environment. Right, he was actively interrogating 00:02:41.780 --> 00:02:44.259 us. Exactly. What's the go with that? It's a 00:02:44.259 --> 00:02:47.460 fundamental inquiry into causality. He wasn't 00:02:47.460 --> 00:02:49.539 satisfied with just knowing what a lock was. 00:02:49.819 --> 00:02:52.000 He needed to understand the hidden mechanics, 00:02:52.240 --> 00:02:54.280 you know, the unseen physical forces that made 00:02:54.280 --> 00:02:56.860 it function. He was already searching for the 00:02:56.860 --> 00:02:59.639 underlying rules of the physical world. But that 00:02:59.639 --> 00:03:02.870 idyllic wildly curious childhood took a really 00:03:02.870 --> 00:03:05.550 devastating turn. When Maxwell was just eight 00:03:05.550 --> 00:03:08.330 years old, his mother developed abdominal cancer. 00:03:08.610 --> 00:03:11.349 Which was tragically untreatable then. Yeah, 00:03:11.490 --> 00:03:13.469 and operation to save her was unsuccessful and 00:03:13.469 --> 00:03:16.389 she passed away. So his education suddenly fell 00:03:16.389 --> 00:03:19.409 to his father and to a hired 16 -year -old tutor. 00:03:20.009 --> 00:03:23.150 And this tutor was, well... notoriously harsh. 00:03:23.530 --> 00:03:26.050 Very conventional, very rigid. Yes, exactly. 00:03:26.430 --> 00:03:28.909 He actually chided young Maxwell for being slow 00:03:28.909 --> 00:03:31.590 and wayward. Can you imagine calling the guy 00:03:31.590 --> 00:03:33.710 who would go on to invent the mathematics of 00:03:33.710 --> 00:03:37.169 electromagnetism slow? It is a profound historical 00:03:37.169 --> 00:03:40.629 irony for sure, but it also highlights a pretty 00:03:40.629 --> 00:03:42.530 common theme in the lives of paradigm -shifting 00:03:42.530 --> 00:03:45.599 thinkers. Their minds just operate on a different 00:03:45.599 --> 00:03:47.680 frequency. Yeah, they don't fit the mold. Right. 00:03:48.139 --> 00:03:50.300 A conventional tutor back then relied entirely 00:03:50.300 --> 00:03:53.060 on rote memorization, just reciting facts and 00:03:53.060 --> 00:03:56.520 dates over and over. They would absolutely misinterpret 00:03:56.520 --> 00:03:59.340 Maxwell's deep methodical processing of complex 00:03:59.340 --> 00:04:03.080 ideas as sluggishness. And that clash with conventional 00:04:03.080 --> 00:04:05.460 expectations only got worse when he was sent 00:04:05.460 --> 00:04:08.259 to the elite Edinburgh Academy at age 10. Now, 00:04:08.259 --> 00:04:10.620 remember, he had been raised in deep isolation 00:04:10.620 --> 00:04:13.280 on a massive country estate. He wasn't exactly 00:04:13.280 --> 00:04:16.540 a city kid. No, not at all. So he shows up on 00:04:16.540 --> 00:04:19.300 his first day wearing a tunic and a pair of homemade 00:04:19.300 --> 00:04:22.420 shoes. And he's speaking with this heavy, rustic 00:04:22.420 --> 00:04:25.660 Galloway accent. The other kids immediately branded 00:04:25.660 --> 00:04:29.259 him with the mocking nickname Dafty, which basically 00:04:29.259 --> 00:04:32.259 means foolish or crazy. Kids can be brutal. They 00:04:32.259 --> 00:04:35.079 really can. But the amazing thing is he never 00:04:35.079 --> 00:04:38.019 complained about it. He was to bore it. And, 00:04:38.060 --> 00:04:39.839 you know, I think about this all the time when 00:04:39.839 --> 00:04:42.079 I look at modern tech visionaries, like the folks 00:04:42.079 --> 00:04:44.240 who drop out of college or show up wearing a 00:04:44.240 --> 00:04:46.040 hoodie and flip -flops to a corporate board meeting. 00:04:46.180 --> 00:04:49.399 Oh, that's a great point. Society has this persistent 00:04:49.399 --> 00:04:52.699 habit of misinterpreting early eccentric genius 00:04:52.699 --> 00:04:55.800 as foolishness just because it doesn't come dressed 00:04:55.800 --> 00:04:58.459 in the expected uniform. That is a highly relevant 00:04:58.459 --> 00:05:01.459 comparison. Because his isolated countryside 00:05:01.459 --> 00:05:04.600 upbringing actually protected his genius, it 00:05:04.600 --> 00:05:06.939 fostered a deeply independent way of thinking. 00:05:07.139 --> 00:05:08.939 Because he didn't care about fitting in. Exactly. 00:05:09.319 --> 00:05:11.300 Because he wasn't trained from birth to think 00:05:11.300 --> 00:05:13.220 conventionally or, you know, care about social 00:05:13.220 --> 00:05:16.680 conformity. He was free to visualize geometry 00:05:16.680 --> 00:05:20.100 and physics in a purely original way. And he 00:05:20.100 --> 00:05:23.480 proved that incredibly early. At just 14 years 00:05:23.480 --> 00:05:26.620 old, he wrote his first scientific paper. 14? 00:05:27.149 --> 00:05:29.949 It's just wild. It really is. He figured out 00:05:29.949 --> 00:05:32.610 a mechanical means of drawing complex mathematical 00:05:32.610 --> 00:05:35.529 curves, specifically multifocal ellipses and 00:05:35.529 --> 00:05:38.410 Cartesian ovals, using a piece of twine and some 00:05:38.410 --> 00:05:41.910 pins. But wait, I'm trying to picture this. How 00:05:41.910 --> 00:05:44.790 does a 14 -year -old do groundbreaking math with 00:05:44.790 --> 00:05:47.279 string? Walk me through that. Well, you might 00:05:47.279 --> 00:05:49.199 know that you can draw a simple oval and ellipse 00:05:49.199 --> 00:05:51.899 by sticking two pins in a board, tying a loose 00:05:51.899 --> 00:05:54.180 loop of string around them, pulling the string 00:05:54.180 --> 00:05:56.420 taut with a pencil, and dragging the pencil all 00:05:56.420 --> 00:05:58.439 the way around. Right, the classy geometry class 00:05:58.439 --> 00:06:01.110 trick. I remember doing that. Exactly. But Maxwell 00:06:01.110 --> 00:06:03.490 figured out how to use multiple pins and varying 00:06:03.490 --> 00:06:06.310 lengths of string folded over itself in specific 00:06:06.310 --> 00:06:09.410 ratios to draw much more complex egg -shaped 00:06:09.410 --> 00:06:13.350 multifocal curves. Wow. Yeah. The 17th century 00:06:13.350 --> 00:06:15.370 philosopher and mathematician René Descartes 00:06:15.370 --> 00:06:18.209 had examined these types of complex curves theoretically. 00:06:18.670 --> 00:06:20.629 But this 14 -year -old boy managed to actually 00:06:20.629 --> 00:06:22.910 simplify their physical mechanical construction. 00:06:23.410 --> 00:06:26.009 It just demonstrates a remarkable spatial genius. 00:06:26.350 --> 00:06:29.269 But because he was only 14, he was deemed too 00:06:29.269 --> 00:06:32.089 young to stand at the rostrum. So an older professor 00:06:32.089 --> 00:06:34.870 named James Forbes had to actually present the 00:06:34.870 --> 00:06:37.110 paper to the Royal Society of Edinburgh for him. 00:06:37.490 --> 00:06:39.550 The establishment just couldn't handle a teenager 00:06:39.550 --> 00:06:42.139 outsmarting them. Nope. which perfectly sets 00:06:42.139 --> 00:06:44.800 the stage for his adult career. Because once 00:06:44.800 --> 00:06:47.220 you can visualize complex geometry with a piece 00:06:47.220 --> 00:06:50.339 of quine, where you go next, you apply that same 00:06:50.339 --> 00:06:53.240 visual genius, the massive and the invisible. 00:06:53.439 --> 00:06:55.279 And he didn't waste any time doing that. No, 00:06:55.279 --> 00:06:58.379 he didn't. By the time he was just 25, he was 00:06:58.379 --> 00:07:01.199 a professor at Marshall College in Aberdeen. 00:07:01.579 --> 00:07:04.160 And he decided to tackle a problem that had baffled 00:07:04.160 --> 00:07:08.360 scientists for 200 years. The Adams Prize at 00:07:08.360 --> 00:07:10.639 Cambridge had issued a challenge to explain the 00:07:10.639 --> 00:07:13.360 nature of Saturn's rings. Why was this such a 00:07:13.360 --> 00:07:16.240 big mystery at the time? Because it was a monumental 00:07:16.240 --> 00:07:19.519 physical paradox. Astronomers could clearly see 00:07:19.519 --> 00:07:21.980 the rings through their telescopes, but the laws 00:07:21.980 --> 00:07:24.019 of physics dictated that they shouldn't exist. 00:07:24.160 --> 00:07:26.920 Wait, really? Why? Well, if the rings were a 00:07:26.920 --> 00:07:30.199 solid, rigid disk, the immense gravitational 00:07:30.199 --> 00:07:32.839 forces of Saturn would tear them apart and shatter 00:07:32.839 --> 00:07:36.300 them? Conversely, if they were made of a continuous 00:07:36.300 --> 00:07:39.220 liquid fluid, the wave action generated by the 00:07:39.220 --> 00:07:42.000 planet's rotation would force the fluid to break 00:07:42.000 --> 00:07:44.939 apart into useless blobs. They should have drifted 00:07:44.939 --> 00:07:47.259 away or crashed into the planet entirely. So 00:07:47.259 --> 00:07:48.819 it made no sense that they were just floating 00:07:48.819 --> 00:07:51.439 there perfectly stable. Right. So Maxwell spends 00:07:51.439 --> 00:07:54.199 two years grinding away at this problem, and 00:07:54.199 --> 00:07:56.839 he mathematically proves that the rings can't 00:07:56.839 --> 00:07:59.660 be solid and they can't be fluid. They must be 00:07:59.660 --> 00:08:02.519 made up of numerous small independent particles 00:08:02.519 --> 00:08:04.819 orbiting the planet, which he called brick bats. 00:08:05.240 --> 00:08:07.779 A very grounded Scottish way to describe celestial 00:08:07.779 --> 00:08:10.160 mechanic. Yeah, brick bats. And he won the prize 00:08:10.160 --> 00:08:12.339 for it. The astronomer royal at the time said 00:08:12.339 --> 00:08:14.199 it was one of the most remarkable applications 00:08:14.199 --> 00:08:16.620 of mathematics to physics he had ever seen. But 00:08:16.620 --> 00:08:19.959 the craziest part? He was totally right. Over 00:08:19.959 --> 00:08:23.279 a century later, in the 1980s, the Voyager spacecraft 00:08:23.279 --> 00:08:25.399 flew by Saturn and sent back high -resolution 00:08:25.399 --> 00:08:28.300 pictures proving exactly what Maxwell had deduced 00:08:28.300 --> 00:08:31.120 using just a pencil and paper. That really illustrates 00:08:31.120 --> 00:08:33.659 the predictive power of his mathematics. It's 00:08:33.659 --> 00:08:36.120 mind -boggling. But Saturn's rings were really 00:08:36.120 --> 00:08:37.980 just the warm -up. Just a little side project. 00:08:38.200 --> 00:08:41.080 Basically, yeah. The true turning point comes 00:08:41.080 --> 00:08:43.820 during his time at King's College London, starting 00:08:43.820 --> 00:08:47.600 in 1860. This is where he produces his magnum 00:08:47.600 --> 00:08:51.279 opus. At the time, electricity and magnetism 00:08:51.279 --> 00:08:54.080 were largely thought of as related but distinct 00:08:54.080 --> 00:08:57.000 phenomena. Michael Faraday had done incredible 00:08:57.000 --> 00:08:59.080 experimental work showing that changing magnetic 00:08:59.080 --> 00:09:01.299 fields could induce electrical currents. Hold 00:09:01.299 --> 00:09:04.519 on, so Faraday did the actual experiments with 00:09:04.519 --> 00:09:06.820 magnets and wires, but where did he hit a wall? 00:09:07.000 --> 00:09:09.559 Well, Faraday was a brilliant experimentalist 00:09:09.559 --> 00:09:11.940 and he envisioned these invisible lines of force 00:09:11.940 --> 00:09:14.580 connecting magnets and electrical charges, but 00:09:14.580 --> 00:09:17.259 he lacked the formal heavy -duty mathematical 00:09:17.259 --> 00:09:20.179 training to prove his theories rigorously. The 00:09:20.179 --> 00:09:22.340 physics community at the time didn't fully buy 00:09:22.340 --> 00:09:24.370 into his invisible lines. They needed the hard 00:09:24.370 --> 00:09:26.669 math. Exactly, they needed proof. So Maxwell 00:09:26.669 --> 00:09:29.889 steps in and completely translates Faraday's 00:09:29.889 --> 00:09:32.929 experimental observations into a rigorous mathematical 00:09:32.929 --> 00:09:36.409 framework. He reduces all known phenomena regarding 00:09:36.409 --> 00:09:39.350 electricity and magnetism into a linked set of 00:09:39.350 --> 00:09:41.909 20 differential equations. Now, okay, before 00:09:41.909 --> 00:09:43.769 you hit fast forward because I just said differential 00:09:43.769 --> 00:09:45.850 equations, stick with me. This isn't just chalkboard 00:09:45.850 --> 00:09:48.129 math. What are these equations actually describing? 00:09:48.399 --> 00:09:50.840 A differential equation is simply the mathematics 00:09:50.840 --> 00:09:53.600 of how things change over time and space. If 00:09:53.600 --> 00:09:56.379 you want to know how heat spreads through a metal 00:09:56.379 --> 00:09:59.480 bar or how a wave ripples through a pond, you 00:09:59.480 --> 00:10:01.960 use a differential equation. Maxwell used them 00:10:01.960 --> 00:10:04.279 to describe exactly how electric and magnetic 00:10:04.279 --> 00:10:06.720 fields shift, interact, and propagate through 00:10:06.720 --> 00:10:10.100 empty space. Making the invisible visible mathematically. 00:10:10.600 --> 00:10:12.919 Exactly. And just for the record, the physicist 00:10:12.919 --> 00:10:15.820 Oliver Heaviside later simplified Maxwell's original 00:10:15.820 --> 00:10:19.350 20 equations down to the four that engineering 00:10:19.350 --> 00:10:21.929 students sweat over today. And in the process 00:10:21.929 --> 00:10:24.649 of working through this math, Maxwell calculates 00:10:24.649 --> 00:10:27.129 the speed at which an electromagnetic field would 00:10:27.129 --> 00:10:29.850 ripple through space. He calculates that these 00:10:29.850 --> 00:10:32.750 waves of oscillating electric and magnetic fields 00:10:32.750 --> 00:10:37.450 travel at a speed of precisely 310 ,740 ,000 00:10:37.450 --> 00:10:39.970 meters per second. Which was a staggering revelation. 00:10:40.480 --> 00:10:42.639 Because that number just happened to perfectly 00:10:42.639 --> 00:10:45.100 match the already known speed of light. And that 00:10:45.100 --> 00:10:47.740 is the ultimate light bulb moment. Pun completely 00:10:47.740 --> 00:10:51.419 intended. Nice one. Thank you. He realizes, and 00:10:51.419 --> 00:10:54.539 he writes this down, that light itself must be 00:10:54.539 --> 00:10:57.399 an electromagnetic wave. So what does this all 00:10:57.399 --> 00:10:59.200 mean? I'm trying to wrap my head around the scale 00:10:59.200 --> 00:11:02.220 of this. Is this like realizing that the ingredients 00:11:02.220 --> 00:11:04.899 you've been studying in a chemistry lab, electricity 00:11:04.899 --> 00:11:07.620 and magnetism, are actually the exact recipe 00:11:07.620 --> 00:11:09.320 for the sunlight shining through your window? 00:11:09.450 --> 00:11:11.809 That is an excellent way to conceptualize it. 00:11:12.330 --> 00:11:14.610 It is the realization that things that appear 00:11:14.610 --> 00:11:17.009 fundamentally different to human senses are, 00:11:17.129 --> 00:11:20.029 at their core, exactly the same mechanism. Mind 00:11:20.029 --> 00:11:23.360 blowing. It really is. Before Maxwell, light, 00:11:23.779 --> 00:11:26.620 electricity, and magnetism were studied in completely 00:11:26.620 --> 00:11:29.720 separate disciplines, he unified them. He proved 00:11:29.720 --> 00:11:32.399 that radio waves, X -rays, the visible light 00:11:32.399 --> 00:11:35.100 we see, they are all just different wavelengths 00:11:35.100 --> 00:11:37.919 of the exact same electromagnetic phenomenon. 00:11:38.360 --> 00:11:41.559 Wow. Now, to be historically accurate, Maxwell 00:11:41.559 --> 00:11:44.379 did believe these waves needed a physical medium 00:11:44.379 --> 00:11:47.340 to travel through, which he called the luminiferous 00:11:47.340 --> 00:11:50.000 ether. Right, the invisible jelly in space. Right. 00:11:50.139 --> 00:11:52.899 Later on, Albert Einstein's theory of special 00:11:52.899 --> 00:11:55.360 relativity would dispense with the ether entirely, 00:11:55.539 --> 00:11:57.419 proving that light can travel through a true 00:11:57.419 --> 00:12:00.600 vacuum. But Einstein explicitly built his entire 00:12:00.600 --> 00:12:03.379 theory of relativity directly upon the foundation 00:12:03.379 --> 00:12:06.139 of Maxwell's equations. Okay, so once Maxwell 00:12:06.139 --> 00:12:08.779 mathematically proved what light actually was, 00:12:09.279 --> 00:12:12.039 he didn't just stop at the abstract theory. He 00:12:12.039 --> 00:12:13.980 immediately started playing with how human beings 00:12:13.980 --> 00:12:16.080 physically perceive it, which brings us to a 00:12:16.080 --> 00:12:18.700 wildly diverse era of his career. Long before 00:12:18.700 --> 00:12:20.820 anyone had a smartphone, Maxwell was obsessed 00:12:20.820 --> 00:12:23.139 with color vision. Which was still a very murky 00:12:23.139 --> 00:12:26.279 field back then. Yeah. Thomas Young had proposed 00:12:26.279 --> 00:12:29.720 that human eyes perceive color through three 00:12:29.720 --> 00:12:32.279 distinct channels, what we call trichromatic 00:12:32.279 --> 00:12:34.539 theory. But it was just a theory. Until Maxwell 00:12:34.539 --> 00:12:37.659 applied linear algebra to prove it. He demonstrated 00:12:37.659 --> 00:12:39.980 mathematically that any color the human eye can 00:12:39.980 --> 00:12:42.919 perceive could be produced by mixing varying 00:12:42.919 --> 00:12:46.139 proportions of three primary colors, red, green, 00:12:46.240 --> 00:12:48.919 and blue. Which he then proved in the real world. 00:12:49.440 --> 00:12:52.480 During an 1861 lecture at the Royal Institution, 00:12:53.139 --> 00:12:56.039 he presented the world's first durable color 00:12:56.039 --> 00:12:58.620 photograph. He had a photographer take pictures 00:12:58.620 --> 00:13:01.539 of a tartan ribbon. Wait, pause. The cameras 00:13:01.539 --> 00:13:03.809 back then only shot in black and white. Right. 00:13:03.909 --> 00:13:05.629 So if you take black and white photos, how do 00:13:05.629 --> 00:13:07.610 you get full color? Walk me through the actual 00:13:07.610 --> 00:13:10.610 physical steps in that lecture hall. It's a brilliant 00:13:10.610 --> 00:13:13.649 physical hack. He had the photographer take three 00:13:13.649 --> 00:13:15.570 separate black and white photos of the exact 00:13:15.570 --> 00:13:17.950 same tartan ribbon. But for the first photo, 00:13:17.950 --> 00:13:20.529 they placed a red glass filter over the lens. 00:13:20.610 --> 00:13:23.389 For the second, a green filter. And for the third, 00:13:23.509 --> 00:13:25.929 a blue filter. So each black and white negative 00:13:25.929 --> 00:13:28.450 only recorded the intensity of that specific 00:13:28.450 --> 00:13:31.269 color of light. During the lecture, Maxwell took 00:13:31.269 --> 00:13:33.549 those three images and projected them onto a 00:13:33.549 --> 00:13:37.269 screen using three separate magic lanterns. He 00:13:37.269 --> 00:13:39.750 put the red filter over the lantern, projecting 00:13:39.750 --> 00:13:42.799 the red image. the green over the green image 00:13:42.799 --> 00:13:46.139 and so on. When those three colored projections 00:13:46.139 --> 00:13:49.360 overlapped perfectly on the wall boom, a full 00:13:49.360 --> 00:13:51.980 color reproduction of the ribbon. That is amazing. 00:13:52.490 --> 00:13:54.690 But my favorite part of this story is that it 00:13:54.690 --> 00:13:58.269 relied on a massive lucky fluke. Yes, it really 00:13:58.269 --> 00:14:00.629 did. The photographic plates they were using 00:14:00.629 --> 00:14:03.250 at the time relied on what's called a wet collodion 00:14:03.250 --> 00:14:06.149 process. OK. The chemicals in that process were 00:14:06.149 --> 00:14:08.529 highly sensitive to blue light, but they were 00:14:08.529 --> 00:14:11.649 virtually insensitive to red light. The red filtered 00:14:11.649 --> 00:14:13.610 image should have been completely blank. The 00:14:13.610 --> 00:14:15.870 experiment should have failed. Why did it work 00:14:15.870 --> 00:14:18.029 then? Did he just do the math wrong in a way 00:14:18.029 --> 00:14:20.230 that accidentally worked out? Researchers actually 00:14:20.230 --> 00:14:23.629 analyzed this a century later in 1961. It turns 00:14:23.629 --> 00:14:26.350 out that the specific red dye used in that particular 00:14:26.350 --> 00:14:29.789 Scottish tartan ribbon strongly reflected invisible 00:14:29.789 --> 00:14:32.899 ultraviolet light. Yeah. And the red glass filter 00:14:32.899 --> 00:14:35.200 they used didn't entirely block ultraviolet light, 00:14:35.500 --> 00:14:37.700 and the photographic plates were highly sensitive 00:14:37.700 --> 00:14:40.320 to it. So the red image was actually captured 00:14:40.320 --> 00:14:43.019 via invisible ultraviolet light bouncing off 00:14:43.019 --> 00:14:45.740 the red fabric. It was a completely accidental 00:14:45.740 --> 00:14:48.059 success that ended up validating a perfectly 00:14:48.059 --> 00:14:50.559 sound theory. The universe just gave him a free 00:14:50.559 --> 00:14:53.139 pass on that one. Pretty much. But the sheer 00:14:53.139 --> 00:14:55.100 breadth of what he was working on at this time 00:14:55.100 --> 00:14:58.159 is staggering. Around the same time he's inventing 00:14:58.159 --> 00:15:00.700 the basis for the RGB pixels on your phone screen, 00:15:01.059 --> 00:15:03.980 he's also casually revolutionizing thermodynamics. 00:15:04.360 --> 00:15:07.120 As one does. Right. He develops what is now known 00:15:07.120 --> 00:15:10.080 as the Maxwell -Boltzmann distribution, which 00:15:10.080 --> 00:15:13.179 is a statistical way of describing how gas molecules 00:15:13.179 --> 00:15:15.320 move at specific velocities and temperatures. 00:15:16.159 --> 00:15:18.279 But what does that actually mean? Why couldn't 00:15:18.279 --> 00:15:20.580 physicists just measure the gas before? Because 00:15:20.580 --> 00:15:22.759 if you have a sealed room full of gas, there 00:15:22.759 --> 00:15:25.320 are trillions upon trillions of molecules bouncing 00:15:25.320 --> 00:15:28.379 into each other at incredibly high speeds. Tracking 00:15:28.379 --> 00:15:30.759 the individual trajectory of every single molecule 00:15:30.759 --> 00:15:33.220 to figure out the temperature or pressure is 00:15:33.220 --> 00:15:35.519 mathematically impossible. You'd need an infinite 00:15:35.519 --> 00:15:38.840 computer. Exactly. What Maxwell did was introduce 00:15:38.840 --> 00:15:42.059 a massive conceptual leap. Instead of trying 00:15:42.059 --> 00:15:44.840 to track the individuals, he introduced the idea 00:15:44.840 --> 00:15:47.360 of using statistical probabilities to describe 00:15:47.360 --> 00:15:49.960 the behavior of the entire crowd of molecules. 00:15:50.639 --> 00:15:53.259 He essentially birthed statistical mechanics. 00:15:53.480 --> 00:15:55.519 It's like instead of trying to predict exactly 00:15:55.519 --> 00:15:57.879 what one specific car will do on the highway, 00:15:58.360 --> 00:16:01.080 you zoom out and use math to accurately predict 00:16:01.080 --> 00:16:03.639 the overall flow of traffic. That's a great analogy. 00:16:03.980 --> 00:16:06.120 And this statistical breakthrough led him to 00:16:06.120 --> 00:16:08.440 propose one of the most famous thought experiments 00:16:08.440 --> 00:16:12.840 in physics, Maxwell's Demon. In 1867, he imagined 00:16:12.840 --> 00:16:15.200 a tiny being that controls a door between two 00:16:15.200 --> 00:16:17.580 chambers of gas. This was designed to challenge 00:16:17.580 --> 00:16:20.100 the second law of thermodynamics, which states 00:16:20.100 --> 00:16:22.379 that entropy, the universe's natural tendency 00:16:22.379 --> 00:16:24.899 toward messy disorder and equilibrium, always 00:16:24.899 --> 00:16:27.299 increases over time. Right, so let's use an analogy 00:16:27.299 --> 00:16:29.940 here. Imagine the two chambers of gas are like 00:16:29.940 --> 00:16:32.320 two rooms in a crowded, sweaty nightclub, and 00:16:32.320 --> 00:16:34.240 the demon is the bouncer standing between them. 00:16:34.440 --> 00:16:36.899 Okay, I like this. The club is getting too hot, 00:16:37.220 --> 00:16:40.019 so the bouncer starts watching the crowd. He 00:16:40.019 --> 00:16:42.519 only lets the sweaty, high -energy, fast -moving 00:16:42.519 --> 00:16:45.679 people go into the left room. And he only lets 00:16:45.679 --> 00:16:48.740 the cool, calm, slow -moving people into the 00:16:48.740 --> 00:16:52.139 right room. Eventually, without touching a thermostat 00:16:52.139 --> 00:16:54.519 or doing any physical mechanical work, he has 00:16:54.519 --> 00:16:57.120 magically made the left room boiling hot and 00:16:57.120 --> 00:17:00.139 the right room freezing cold. Exactly. By using 00:17:00.139 --> 00:17:02.779 only information sorting the fast molecules from 00:17:02.779 --> 00:17:05.660 the slow ones, the demon decreases the entropy 00:17:05.660 --> 00:17:08.630 of the system. It completely broke people's brains 00:17:08.630 --> 00:17:11.009 at the time and forced theoretical physicists 00:17:11.009 --> 00:17:13.950 to grapple with the deep fundamental relationship 00:17:13.950 --> 00:17:17.250 between information and entropy. And if that 00:17:17.250 --> 00:17:19.869 wasn't enough, just a year later, in 1868, he 00:17:19.869 --> 00:17:22.430 writes a paper called On Governors, which serves 00:17:22.430 --> 00:17:24.589 as the foundational mathematical text for modern 00:17:24.589 --> 00:17:27.529 control theory and cybernetics. But again, let's 00:17:27.529 --> 00:17:29.730 ground this. What is this steam governor actually 00:17:29.730 --> 00:17:31.990 doing? Picture a massive steam engine in a factory 00:17:31.990 --> 00:17:34.410 spinning a heavy metal shaft. If the engine gets 00:17:34.410 --> 00:17:36.329 too hot and spins too fast, it could literally 00:17:36.329 --> 00:17:39.769 explode. Bad news. Very bad news. A governor 00:17:39.769 --> 00:17:42.710 was a mechanical safety device. It consisted 00:17:42.710 --> 00:17:45.670 of two heavy metal balls on hinges attached to 00:17:45.670 --> 00:17:48.809 that spinning shaft. As the shaft spins faster, 00:17:49.289 --> 00:17:51.950 centrifugal force pushes the heavy balls outward. 00:17:52.170 --> 00:17:54.529 Okay, I can picture that. This outward rising 00:17:54.529 --> 00:17:57.660 motion pulls on a lever that automatically closes 00:17:57.660 --> 00:18:00.740 the steam valve, starving the engine of steam 00:18:00.740 --> 00:18:04.119 and slowing it down. As it slows, the balls drop, 00:18:04.400 --> 00:18:07.160 the valve opens, and it speeds up again. It's 00:18:07.160 --> 00:18:09.220 a mechanical feedback loop. Precisely. It's a 00:18:09.220 --> 00:18:12.079 machine regulating itself. Maxwell was the first 00:18:12.079 --> 00:18:14.960 to rigorously mathematically describe how these 00:18:14.960 --> 00:18:17.400 feedback loops function to maintain stability. 00:18:17.640 --> 00:18:20.380 And in doing so, he also becomes the first person 00:18:20.380 --> 00:18:22.920 to truly grasp what we now call the butterfly 00:18:22.920 --> 00:18:25.960 effect, the idea of sensitive dependence on initial 00:18:25.960 --> 00:18:28.579 conditions. He realized that in some complex 00:18:28.579 --> 00:18:31.000 systems, a microscopic change at the beginning 00:18:31.000 --> 00:18:33.420 can lead to wildly different outcomes. So you're 00:18:33.420 --> 00:18:35.579 telling the listener that the same guy who essentially 00:18:35.579 --> 00:18:37.880 invented the RGB color processing for their television 00:18:37.880 --> 00:18:40.180 also originated the mathematics for statistical 00:18:40.180 --> 00:18:42.599 mechanics, cybernetics, and chaos theory. Was 00:18:42.599 --> 00:18:44.750 there anything this guy didn't dabble in? This 00:18:44.750 --> 00:18:47.349 raises an important question about how we fundamentally 00:18:47.349 --> 00:18:51.009 categorize knowledge. Today we have highly specialized 00:18:51.009 --> 00:18:54.230 siloed university departments, psychology for 00:18:54.230 --> 00:18:57.029 color perception, mechanical engineering for 00:18:57.029 --> 00:19:00.190 steam engine governors, theoretical physics for 00:19:00.190 --> 00:19:02.490 thermodynamics. Right, everyone stays in their 00:19:02.490 --> 00:19:05.269 lane. But Maxwell didn't see rigid walls between 00:19:05.269 --> 00:19:08.029 these disciplines. He didn't see himself as dabbling 00:19:08.029 --> 00:19:10.910 in unrelated fields. He was looking for universal 00:19:10.910 --> 00:19:13.210 mathematical patterns that governed all physical 00:19:13.210 --> 00:19:16.740 reality. He saw the universe as a deeply interconnected 00:19:16.740 --> 00:19:19.400 web of mechanisms. With all this relentless, 00:19:19.480 --> 00:19:22.140 massive intellectual processing going on, you 00:19:22.140 --> 00:19:25.180 might picture Maxwell as this cold, hyperlogical, 00:19:25.220 --> 00:19:27.859 calculating machine of a human being. But the 00:19:27.859 --> 00:19:30.440 truth is, he was deeply human, vulnerable, and 00:19:30.440 --> 00:19:33.140 actually quite poetic. Very much so. His personal 00:19:33.140 --> 00:19:35.279 life reflects a deep capacity for connection 00:19:35.279 --> 00:19:37.539 and collaboration. Take his marriage to Catherine 00:19:37.539 --> 00:19:40.059 Mary Duar. She was seven years older than him 00:19:40.059 --> 00:19:42.559 and their relationship was incredibly collaborative. 00:19:43.140 --> 00:19:45.079 She didn't just, you know, support him from the 00:19:45.079 --> 00:19:47.799 sidelines or make his tea. She actively assisted 00:19:47.799 --> 00:19:50.940 him in his laboratory running complex experiments 00:19:50.940 --> 00:19:53.880 on the viscosity of gases with him. A true partnership. 00:19:54.180 --> 00:19:56.900 Yeah. His biographer and lifelong friend described 00:19:56.900 --> 00:19:59.400 their marriage as one of unexampled devotion. 00:20:00.079 --> 00:20:02.720 He also had a profound love for Scottish poetry. 00:20:02.970 --> 00:20:05.970 He memorized vast amounts of it, and he regularly 00:20:05.970 --> 00:20:08.450 wrote his own. Yeah, he wrote this amazing physics 00:20:08.450 --> 00:20:11.390 -themed poem called Rigid Body Sings, set to 00:20:11.390 --> 00:20:13.349 the tune of the classic Robert Burns song, Coming 00:20:13.349 --> 00:20:15.910 Through the Rye. He would apparently sit around 00:20:15.910 --> 00:20:17.809 and sing it while accompanying himself on the 00:20:17.809 --> 00:20:19.950 guitar. That's a great image. It opens with the 00:20:19.950 --> 00:20:21.809 lines, Jin -a -body meet a body flying through 00:20:21.809 --> 00:20:24.910 the air. Jin -a -body hit a body. Will it fly? 00:20:25.210 --> 00:20:28.259 And where? It's just so charming and beneath 00:20:28.259 --> 00:20:31.579 that quirky charm was a deeply held intensely 00:20:31.579 --> 00:20:35.180 philosophical belief system. Maxwell was an evangelical 00:20:35.180 --> 00:20:37.900 Presbyterian and his faith was a core component 00:20:37.900 --> 00:20:40.559 of his identity. During his time at Cambridge, 00:20:40.740 --> 00:20:43.079 he was a member of the elite intellectual society 00:20:43.079 --> 00:20:46.759 known as the Apostles. It was there that he articulated 00:20:46.759 --> 00:20:49.599 his belief that true faith and scientific inquiry 00:20:49.599 --> 00:20:52.740 were not in conflict, but rather entirely complementary. 00:20:53.279 --> 00:20:55.740 He actually wrote a brilliant essay for the Apostles 00:20:55.740 --> 00:20:58.519 where he stated, nothing is to be wholly ground 00:20:58.519 --> 00:21:01.380 consecrated to stationary faith. He believed 00:21:01.380 --> 00:21:03.180 that you shouldn't hide from questioning things 00:21:03.180 --> 00:21:05.559 just because they felt sacred. He thought that 00:21:05.559 --> 00:21:08.240 true faith required fearless open investigation 00:21:08.240 --> 00:21:11.279 into the natural world. If God created the universe, 00:21:11.700 --> 00:21:14.220 then studying exactly how it works with absolute 00:21:14.220 --> 00:21:16.980 uncompromising mathematical rigor was a form 00:21:16.980 --> 00:21:19.339 of devotion. Unfortunately, his time to study 00:21:19.339 --> 00:21:21.839 that universe was tragically cut short. In April 00:21:21.839 --> 00:21:24.539 of 1879, he began to have difficulty swallowing. 00:21:24.920 --> 00:21:27.000 He was diagnosed with abdominal cancer and he 00:21:27.000 --> 00:21:29.039 died in November of that year. Here's where it 00:21:29.039 --> 00:21:32.759 gets really interesting. In a very dark but almost 00:21:32.759 --> 00:21:35.380 beautifully mathematical way, he died at the 00:21:35.380 --> 00:21:38.440 exact same age, 48 years old, from the exact 00:21:38.440 --> 00:21:40.980 same disease abdominal cancer that had taken 00:21:40.980 --> 00:21:42.779 his mother when he was just eight years old. 00:21:42.839 --> 00:21:46.440 It's eerie. It really is. It framed his entire 00:21:46.440 --> 00:21:49.400 life, from the trauma that defined his childhood 00:21:49.400 --> 00:21:52.759 to his own passing, as this poignant, perfectly 00:21:52.759 --> 00:21:56.059 symmetrical closed loop. And yet, accounts from 00:21:56.059 --> 00:21:58.759 his final days describe a man of immense peace. 00:21:59.500 --> 00:22:02.200 The minister who visited him was astounded by 00:22:02.200 --> 00:22:05.460 his lucidity. As death approached, Maxwell told 00:22:05.460 --> 00:22:07.420 a colleague from Cambridge that he had never 00:22:07.420 --> 00:22:10.480 had a violent shove all my life. Wow. Yeah. He 00:22:10.480 --> 00:22:12.400 felt he had been treated gently by the world 00:22:12.400 --> 00:22:15.160 and his only desire was to have served his generation. 00:22:15.339 --> 00:22:17.619 Which is the understatement of the century. Completely. 00:22:17.920 --> 00:22:20.019 If we connect this to the bigger picture, the 00:22:20.019 --> 00:22:22.240 true measure of Maxwell's legacy might best be 00:22:22.240 --> 00:22:24.599 summarized by Albert Einstein himself. The ultimate 00:22:24.599 --> 00:22:28.640 endorsement. Exactly. In 1922, Einstein was visiting 00:22:28.640 --> 00:22:31.720 the University of Cambridge. His hosts remarked 00:22:31.720 --> 00:22:33.680 that Einstein had been able to do such great 00:22:33.680 --> 00:22:36.559 things because he stood on the shoulders of Isaac 00:22:36.559 --> 00:22:40.019 Newton. Einstein immediately corrected him, replying, 00:22:40.059 --> 00:22:42.259 no, I don't. I stand on the shoulders of Maxwell. 00:22:42.759 --> 00:22:44.859 So as we wrap up this deep dive, I want you to 00:22:44.859 --> 00:22:47.619 think about that. Every single time you connect 00:22:47.619 --> 00:22:50.059 to a Wi -Fi network, every time you take a picture 00:22:50.059 --> 00:22:52.359 on your phone and look at it on a high -definition 00:22:52.359 --> 00:22:55.160 color screen, every time you hear someone casually 00:22:55.160 --> 00:22:57.559 mention the butterfly effect, you are interacting 00:22:57.559 --> 00:23:00.240 with the ghost of James Clerk Maxwell. A legacy 00:23:00.240 --> 00:23:03.099 that touches almost everything we do. Yeah. A 00:23:03.099 --> 00:23:04.940 boy from the Scottish countryside who was called 00:23:04.940 --> 00:23:07.660 Dafty because his shoes were weird, but who ended 00:23:07.660 --> 00:23:10.319 up writing the physical source code for the modern 00:23:10.319 --> 00:23:12.559 world. And that leaves you with a final thought 00:23:12.559 --> 00:23:14.920 to consider as you go about your day. In our 00:23:14.920 --> 00:23:17.500 modern world, characterized by constant information 00:23:17.500 --> 00:23:20.220 overload and digital distractions, we take almost 00:23:20.220 --> 00:23:22.220 everything around us completely for granted. 00:23:22.339 --> 00:23:25.259 We really do. We accept the magic of our technology 00:23:25.259 --> 00:23:28.839 without a second thought. So what everyday mundane 00:23:28.839 --> 00:23:31.059 phenomenon in your own life are you ignoring 00:23:31.059 --> 00:23:33.920 right now? What invisible mechanism might just 00:23:33.920 --> 00:23:36.460 hold the key to a profound realization if only 00:23:36.460 --> 00:23:38.619 you paused, looked closely, and asked yourself 00:23:38.619 --> 00:23:39.559 what's the go with that?