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Okay, so imagine you're at the beach, you know, just looking out at the ocean.

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Ah, nice.

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Waves are crashing and the tide's going in and out.

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And then you look up and there are billions of stars.

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Yeah.

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It's beautiful, right?

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Mm-hmm.

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But it's also kind of powerful in a way.

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Absolutely.

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And it's all controlled by these four forces.

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It is, yeah.

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Welcome to Cosmos in a Pod, the Space and Astronomy series.

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Please like, comment, share, and subscribe.

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We appreciate it.

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So these forces, they're kind of like the rules of the universe.

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Yeah.

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They tell everything how to behave.

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That's right.

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Everything from the triniest particles to the largest galaxies.

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So are we ready to dive in?

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Let's do it.

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Okay.

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So I think the best place to start is with gravity.

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Okay, yeah, the most familiar one.

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Right, everyone knows about gravity.

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Right, it's what keeps our feet on the ground.

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Exactly.

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And it makes the planets go around the sun.

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Mm-hmm.

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Holds the moon in orbit around the Earth.

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But I've always wondered, if gravity is so important,

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you know, why is it called the weakest force?

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That's a good question.

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It seems counterintuitive, right?

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It does.

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But even though it's weak compared to the other forces,

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it has a couple of advantages.

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Like what?

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First, it has infinite range, it never gives up.

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And second, it's always attractive, never repulsive.

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So even if it's weak at like the atomic level,

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when you get enough matter together, gravity starts to win.

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Exactly, like think of it like a snowball rolling down a hill.

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It just keeps getting bigger and bigger.

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I get it.

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And that's how gravity shapes like galaxies

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and the entire universe.

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Makes sense.

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But then Einstein came along and said, hold on a second.

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Yeah, he changed everything.

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With his theory of relativity.

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Mm-hmm, he said gravity isn't a force at all,

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it's like a curvature in space time.

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Whoa, okay, so explain that one to me.

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So imagine a bowling ball on a stretched out sheet.

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Okay.

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The ball makes a dip, right?

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And anything rolling nearby will fall towards it.

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Okay, I can picture that.

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So it's not that objects are being pulled together,

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they're just following the curves in space time.

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Wow, my mind is kind of blown.

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It is pretty wild.

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But there's still one thing missing, isn't there?

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You're talking about the graviton.

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Yeah, the graviton.

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You see, we have this model of the universe,

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the standard model,

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and it explains all the other forces

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with these force carrying particles.

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Right.

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But gravity doesn't quite fit in yet.

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So the standard model is like a blueprint of the universe,

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but it's missing a piece.

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In a way, yeah, and that missing piece is the graviton.

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So if we find it, that would mean?

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It would mean we could finally unify gravity

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with quantum mechanics.

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And that would be huge, right?

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Absolutely massive.

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It would be a step towards a theory of everything.

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A theory that explains everything.

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That'd be pretty cool.

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It would revolutionize physics.

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Imagine understanding the universe

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at its most fundamental level.

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Wow.

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So we've talked about the force that shapes the universe.

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Now let's go smaller.

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Let's go.

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Like way smaller to the heart of the atom.

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Ah, the strong nuclear force.

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Yeah, the strong force.

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What's that all about?

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So if gravity is the architect of the universe,

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then the strong force is the builder of matter.

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It holds the nucleus of an atom together.

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The nucleus, that's where the protons and neutrons are.

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Exactly, but here's the thing.

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Protons have a positive charge,

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so they should repel each other.

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Right, like charges repel, opposites attract.

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Right, but at these tiny scales,

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the strong force is much stronger

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than the electromagnetic force.

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So even though they wanna push apart,

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something is holding them together.

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Yes, the strong force.

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It acts like a glue binding the protons and neutrons together.

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And the glue is?

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Gluons.

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Okay, gluons, got it.

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So how strong are we talking?

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Imagine trying to pull apart two incredibly strong magnets

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that are stuck together.

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Okay, that's pretty strong.

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It's so strong that a teaspoon full of neutron star material

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would weigh billions of tons on Earth.

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Billions of tons in a teaspoon.

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Yep, because it's packed so densely together

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by the strong force.

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But if it's so strong,

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why doesn't it pull everything in the universe together?

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Why doesn't it be gravity?

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That's because unlike gravity,

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the strong force is a very limited range.

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It only works inside the nucleus.

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Ah, so it's like a super strong short range force.

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Exactly, and gravity is a weak long range force.

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They balance each other out.

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I see.

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But wait, there's another nuclear force, right?

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The weak force.

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You're right, we can't forget about that one.

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It might not sound as impressive,

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but it plays some critical roles.

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Like what?

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It's responsible for radioactive decay.

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Okay.

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And it helps transform elements.

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It's actually what powers the sun.

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So the strong force holds the nucleus together

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and the weak force changes the elements.

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Exactly, it's like the alchemist of the universe,

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constantly transforming matter at its core.

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Wow, that's pretty amazing.

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It is.

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The weak force is constantly at work,

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shaping the universe in subtle but profound ways.

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Okay, so we've got gravity, the strong force,

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the weak force.

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What's next?

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Well, the next one is the force

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that's probably most familiar to us in our everyday lives.

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You mean?

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Electromagnetism.

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Electromagnetism, the force that literally

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lights up our world.

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Yeah, it's responsible for electricity, magnetism, light.

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Pretty much everything we use in our technology.

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And the beautiful colors we see.

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That too.

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And it's all based on one simple principle,

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opposite charges attract and like charges repel.

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So the same force that makes a static shock

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when you rub your feet on the carpet?

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Yes.

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Is also behind those amazing northern lights.

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Exactly, it's all thanks to the photon,

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the force carrier for electromagnetism.

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It zips around at the speed of light,

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connecting charged particles.

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Wow, it's incredible how one force can do so much.

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Yeah.

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You mentioned the standard model earlier.

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Right.

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Where does electromagnetism fit into that?

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That's a great question.

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It turns out that electromagnetism and the weak force

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are actually two sides of the same coin.

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Really, they seem so different.

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I know, but physicists have unified them

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into a single theory called the electroweak theory.

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So we've gone from four fundamental forces down to three.

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Gravity, the strong force, and this electroweak force.

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Exactly.

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It makes you wonder, could we go even further?

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Could we unify all the forces?

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That's the dream, isn't it?

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To find a single theory that explains everything,

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a theory of everything.

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That would be amazing.

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It would be a revolution in our understanding

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of the universe.

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Imagine the possibilities.

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It's mind boggling to think about.

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So what would a unified theory tell us about reality?

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It would suggest that everything is interconnected

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at the most fundamental level,

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that there's a deep underlying unity

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beneath all the apparent diversity.

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Wow, that's deep.

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But this quest for unification,

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it's not just about satisfying our curiosity, right?

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No, there are practical implications too.

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Imagine harnessing the power of gravity for space travel.

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Or creating new materials

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by manipulating the strong force.

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Exactly.

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A theory of everything could revolutionize technology

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and our understanding of the cosmos.

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It sounds like science fiction.

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Yeah.

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But the more we learn about the universe,

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the more we realize that anything is possible.

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That's the beauty of science.

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It's always pushing the boundaries

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of what we thought was possible.

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So we've traveled from the force that shapes galaxies

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to the forces that govern the heart of matter.

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And it seems like with every answer,

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we uncover more questions.

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That's the nature of exploration.

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It's a journey without end,

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always pushing us to learn more.

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And as we delve deeper into these fundamental forces,

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we gain a greater appreciation

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for the complexity and the beauty of the universe.

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Absolutely.

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It's a reminder of how much we still have to learn

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and how much there's left to discover.

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It really is.

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And those transformations,

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they're happening everywhere, right?

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Yeah.

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I mean, even inside us, in our bodies.

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That's right.

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Like the weak force controls the decay

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of radioactive isotopes that are naturally in our bodies.

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So even the weak force, it's important for life.

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Definitely.

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It's a subtle farce, but it's essential.

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It's amazing how these tiny forces

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can have such a huge impact.

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It is.

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I mean, we've talked about gravity,

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strong force, weak force.

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Right.

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But what about the force we see every day?

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You're talking about electromagnetism.

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Yeah, electromagnetism.

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The force that powers our world.

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Exactly.

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Our lights, our phones, everything.

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Yeah, electricity, magnetism, light.

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It's all electromagnetism.

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It's like the multitasker of forces.

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It really is.

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And it all boils down to the interaction

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between charged particles.

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So opposites attract, likes repel.

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Exactly.

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That's the basic principle.

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And it governs everything from lightning to,

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well, a gentle breeze.

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Wait, so the same force that gives you a static shock.

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Yes.

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Causes the Northern Lights.

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That's right.

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All thanks to the photon,

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the force carrier for electromagnetism.

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The photon.

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Zipping around at the speed of light.

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Connecting charged particles.

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It's crazy how one force can create such amazing things.

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It is.

277
00:08:55,240 --> 00:08:56,160
But hold on, we were talking about

278
00:08:56,160 --> 00:08:57,440
the Standard Model earlier.

279
00:08:57,440 --> 00:08:58,440
Yes.

280
00:08:58,440 --> 00:09:00,680
How does electromagnetism fit in with that?

281
00:09:00,680 --> 00:09:04,000
Well, this is where things get really interesting.

282
00:09:04,000 --> 00:09:04,880
Okay, tell me more.

283
00:09:04,880 --> 00:09:07,600
It turns out that electromagnetism

284
00:09:07,600 --> 00:09:11,600
and the weak force, they're actually connected.

285
00:09:11,600 --> 00:09:12,720
No way, really.

286
00:09:12,720 --> 00:09:13,680
They seem so different.

287
00:09:13,680 --> 00:09:14,560
I know.

288
00:09:14,560 --> 00:09:16,560
But physicists figured out that there are actually

289
00:09:16,560 --> 00:09:18,480
two aspects of the same force.

290
00:09:18,480 --> 00:09:20,520
Wow, so like two sides of the same coin.

291
00:09:20,520 --> 00:09:21,440
Exactly.

292
00:09:21,440 --> 00:09:25,120
And this discovery led to the Electro-Weak Theory.

293
00:09:25,120 --> 00:09:27,320
So now we're down to just three forces.

294
00:09:27,320 --> 00:09:31,560
Gravity, the strong force, and this Electro-Weak Force.

295
00:09:31,560 --> 00:09:32,400
That's right.

296
00:09:32,400 --> 00:09:34,880
I can't help but think, could we go even further?

297
00:09:34,880 --> 00:09:37,280
Could all the forces be unified?

298
00:09:37,280 --> 00:09:40,000
That's the ultimate goal for many physicists.

299
00:09:40,000 --> 00:09:41,240
The theory of everything, huh?

300
00:09:41,240 --> 00:09:42,080
Exactly.

301
00:09:42,080 --> 00:09:45,520
A single theory that explains everything in the universe.

302
00:09:45,520 --> 00:09:47,240
That would be groundbreaking.

303
00:09:47,240 --> 00:09:49,360
What would that mean for our understanding of,

304
00:09:49,360 --> 00:09:50,560
well, everything?

305
00:09:50,560 --> 00:09:53,040
It would suggest that everything is connected

306
00:09:53,040 --> 00:09:55,320
at the most fundamental level.

307
00:09:55,320 --> 00:09:58,200
A deep unity beneath all the diversity we see.

308
00:09:58,200 --> 00:10:00,120
That's almost a philosophical idea.

309
00:10:00,120 --> 00:10:02,320
It is, but it has real implications

310
00:10:02,320 --> 00:10:04,160
for science and technology as well.

311
00:10:04,160 --> 00:10:05,600
I mean, imagine what we could do

312
00:10:05,600 --> 00:10:07,080
if we could control these forces.

313
00:10:07,080 --> 00:10:07,920
Exactly.

314
00:10:07,920 --> 00:10:09,440
We could revolutionize space travel,

315
00:10:09,440 --> 00:10:10,800
develop new materials.

316
00:10:10,800 --> 00:10:13,000
The possibilities are endless.

317
00:10:13,000 --> 00:10:14,960
It sounds like something out of a science fiction movie.

318
00:10:14,960 --> 00:10:17,440
Maybe, but who knows what the future holds.

319
00:10:17,440 --> 00:10:21,040
The more we learn, the more we realize anything is possible.

320
00:10:21,040 --> 00:10:23,600
Okay, so we've covered gravity, the strong force,

321
00:10:23,600 --> 00:10:25,440
the weak force, the Electro-Weak Force.

322
00:10:25,440 --> 00:10:26,520
There's a lit journey.

323
00:10:26,520 --> 00:10:29,040
It is, but it seems like the deeper we go,

324
00:10:29,040 --> 00:10:30,200
the more questions we have.

325
00:10:30,200 --> 00:10:31,120
That's the beauty of it.

326
00:10:31,120 --> 00:10:32,960
It's a never-ending exploration.

327
00:10:32,960 --> 00:10:34,160
It's humbling, you know.

328
00:10:34,160 --> 00:10:36,840
It is, but it's also incredibly exciting.

329
00:10:36,840 --> 00:10:38,240
There's so much more to learn.

330
00:10:38,240 --> 00:10:39,800
Speaking of learning more,

331
00:10:39,800 --> 00:10:43,000
we've been talking about forces in atoms and galaxies.

332
00:10:43,000 --> 00:10:43,840
Right.

333
00:10:43,840 --> 00:10:47,000
But there are some places where gravity is the main player.

334
00:10:47,000 --> 00:10:48,200
Oh, you mean black holes?

335
00:10:48,200 --> 00:10:49,160
Yeah, black holes.

336
00:10:49,160 --> 00:10:51,400
Those places where gravity is so strong,

337
00:10:51,400 --> 00:10:52,480
nothing can escape.

338
00:10:52,480 --> 00:10:53,840
They're fascinating, aren't they?

339
00:10:53,840 --> 00:10:56,160
Regions of space time where the laws of physics

340
00:10:56,160 --> 00:10:57,240
are pushed to their limits.

341
00:10:57,240 --> 00:10:58,920
Exactly, it's like gravity wins there.

342
00:10:58,920 --> 00:10:59,760
It does.

343
00:10:59,760 --> 00:11:02,360
Black holes are like cosmic laboratories

344
00:11:02,360 --> 00:11:04,720
where we can test our theories about gravity.

345
00:11:04,720 --> 00:11:05,880
So even though they're dark,

346
00:11:05,880 --> 00:11:07,360
they can teach us about the universe.

347
00:11:07,360 --> 00:11:08,640
Exactly.

348
00:11:08,640 --> 00:11:12,200
By observing how matter behaves around black holes,

349
00:11:12,200 --> 00:11:13,680
we can learn a lot about gravity

350
00:11:13,680 --> 00:11:15,720
and how it interacts with the other forces.

351
00:11:15,720 --> 00:11:18,200
It's incredible that we can even study them.

352
00:11:18,200 --> 00:11:20,320
We're actually seeing images of black holes now.

353
00:11:20,320 --> 00:11:21,400
It's amazing, isn't it?

354
00:11:21,400 --> 00:11:25,320
We're seeing these objects that were once just theoretical.

355
00:11:25,320 --> 00:11:27,080
And who knows what else is out there

356
00:11:27,080 --> 00:11:28,720
waiting to be discovered?

357
00:11:28,720 --> 00:11:31,480
The universe is full of surprises, that's for sure.

358
00:11:31,480 --> 00:11:33,960
Every new discovery pushes the boundaries

359
00:11:33,960 --> 00:11:35,640
of our knowledge even further.

360
00:11:35,640 --> 00:11:38,480
It's a reminder of how vast and mysterious

361
00:11:38,480 --> 00:11:40,120
the universe truly is.

362
00:11:40,120 --> 00:11:40,960
It is.

363
00:11:40,960 --> 00:11:43,040
And it's a call to keep exploring

364
00:11:43,040 --> 00:11:44,520
and keep asking questions.

365
00:11:44,520 --> 00:11:45,720
Yeah, it's like peeling an onion.

366
00:11:45,720 --> 00:11:47,160
Every layer has another layer.

367
00:11:47,160 --> 00:11:49,600
And sometimes those layers make you cry a little.

368
00:11:49,600 --> 00:11:50,560
That's a good one.

369
00:11:50,560 --> 00:11:51,760
But speaking of layers,

370
00:11:51,760 --> 00:11:56,600
we've talked about forces in atoms in galaxies,

371
00:11:56,600 --> 00:11:59,640
but there are places where gravity

372
00:11:59,640 --> 00:12:01,680
is like the star of the show.

373
00:12:01,680 --> 00:12:03,720
Ah, you're talking about black holes.

374
00:12:03,720 --> 00:12:04,880
Yeah, black holes.

375
00:12:04,880 --> 00:12:06,680
Those places where gravity is so strong

376
00:12:06,680 --> 00:12:09,160
that nothing, not even light, can get out.

377
00:12:09,160 --> 00:12:11,840
Right, they're like cosmic vacuum cleaners,

378
00:12:11,840 --> 00:12:13,760
sucking up everything around them.

379
00:12:13,760 --> 00:12:14,640
Exactly.

380
00:12:14,640 --> 00:12:16,840
They really test our understanding of the universe.

381
00:12:16,840 --> 00:12:17,680
They do.

382
00:12:17,680 --> 00:12:18,520
They're like a proving ground

383
00:12:18,520 --> 00:12:20,000
for our theories about gravity.

384
00:12:20,000 --> 00:12:22,520
So even though we can't see them directly,

385
00:12:22,520 --> 00:12:23,680
they can teach us a lot.

386
00:12:23,680 --> 00:12:24,520
Exactly.

387
00:12:24,520 --> 00:12:26,680
We can study how matter behaves around them,

388
00:12:26,680 --> 00:12:29,240
and that gives us clues about how gravity works

389
00:12:29,240 --> 00:12:30,760
in extreme conditions.

390
00:12:30,760 --> 00:12:32,880
And now we can even take pictures of them,

391
00:12:32,880 --> 00:12:35,120
like that super massive black hole at the center

392
00:12:35,120 --> 00:12:35,960
of our galaxy.

393
00:12:35,960 --> 00:12:36,880
I know, it's amazing.

394
00:12:36,880 --> 00:12:39,600
It's like we're peeking into the heart of a monster.

395
00:12:39,600 --> 00:12:42,240
It makes you wonder, what else is out there?

396
00:12:42,240 --> 00:12:45,000
What other crazy things haven't we discovered yet?

397
00:12:45,000 --> 00:12:47,280
The universe is full of surprises, that's for sure.

398
00:12:47,280 --> 00:12:50,080
There's always something new to find.

399
00:12:50,080 --> 00:12:52,400
So as we wrap up our deep dive

400
00:12:52,400 --> 00:12:55,440
into the four fundamental forces,

401
00:12:55,440 --> 00:12:57,560
I'm feeling a little overwhelmed, to be honest.

402
00:12:57,560 --> 00:12:59,440
Yeah, it's a lot to take in,

403
00:12:59,440 --> 00:13:01,680
but it's also pretty inspiring, isn't it?

404
00:13:01,680 --> 00:13:02,640
It is.

405
00:13:02,640 --> 00:13:04,360
I mean, we've learned so much,

406
00:13:04,360 --> 00:13:06,440
but it's clear that we've only scratched the surface.

407
00:13:06,440 --> 00:13:08,160
That's the beauty of science.

408
00:13:08,160 --> 00:13:09,880
There's always more to learn.

409
00:13:09,880 --> 00:13:11,400
Always another question to ask.

410
00:13:11,400 --> 00:13:13,520
It's like we've been given a glimpse behind the curtain.

411
00:13:13,520 --> 00:13:14,360
Yeah.

412
00:13:14,360 --> 00:13:15,760
You know, a peek at the machinery

413
00:13:15,760 --> 00:13:17,040
that makes the universe tick.

414
00:13:17,040 --> 00:13:17,960
Exactly.

415
00:13:17,960 --> 00:13:20,880
And even though we don't understand everything yet,

416
00:13:20,880 --> 00:13:22,840
that glimpse is enough to make you appreciate

417
00:13:22,840 --> 00:13:24,000
the wonder of it all.

418
00:13:24,000 --> 00:13:25,520
It really is.

419
00:13:25,520 --> 00:13:27,880
So here's a final thought for everyone listening.

420
00:13:27,880 --> 00:13:29,520
We've talked about how these forces

421
00:13:29,520 --> 00:13:31,120
shape everything around us.

422
00:13:31,120 --> 00:13:34,320
But if they were all unified in the early universe,

423
00:13:34,320 --> 00:13:36,880
what does that tell us about the nature of reality?

424
00:13:36,880 --> 00:13:39,400
Are we all connected in some fundamental way?

425
00:13:39,400 --> 00:13:40,640
Those are big questions,

426
00:13:40,640 --> 00:13:42,680
questions that scientists and philosophers

427
00:13:42,680 --> 00:13:44,720
have been wrestling with for centuries.

428
00:13:44,720 --> 00:13:47,280
And maybe someday we'll have the answers.

429
00:13:47,280 --> 00:13:51,000
Maybe, but until then the mystery remains.

430
00:13:51,000 --> 00:13:53,440
And that's part of what makes the universe so fascinating.

431
00:13:53,440 --> 00:13:55,000
It definitely does.

432
00:13:55,000 --> 00:13:57,040
Well, that's about all the time we have for today.

433
00:13:57,040 --> 00:13:59,960
Time flies when you're talking about fundamental forces.

434
00:13:59,960 --> 00:14:01,320
It really does.

435
00:14:01,320 --> 00:14:02,800
We hope you enjoyed this deep dive

436
00:14:02,800 --> 00:14:05,360
into the four forces that shape our universe.

437
00:14:05,360 --> 00:14:07,320
Be sure to follow Cosmos in a pod

438
00:14:07,320 --> 00:14:09,200
and subscribe to our YouTube channel

439
00:14:09,200 --> 00:14:12,680
for more fascinating explorations into the cosmos.

440
00:14:12,680 --> 00:14:31,680
Until next time, keep looking up.