Every Branch of Science Explained in 09 Minutes

0:00 Welcome to physics.

0:01 The branch of science that basically asks how does the

0:04 universe actually work.

0:05 Physics is all about laws.

0:07 Not the courtroom kind, but

0:09 the kind that govern everything from the

0:11 motion of planets to the way your phone

0:12 battery dies way too fast.

0:14 It all started with ancient thinkers wondering

0:16 why stuff falls down.

0:17 But then came Isaac Newton who saw an apple fall and

0:20 decided, hey, maybe the same thing

0:22 pulling this apple to Earth also holds

0:24 the moon in orbit.

0:25 Boom.

0:26 Gravity.

0:27 Physics splits into two main zones.

0:29 Classical physics, big stuff you can

0:31 see, cars, cannonballs, planets, roller

0:33 coasters.

0:34 Modern physics, tiny or weird

0:36 stuff like atoms, light, black holes,

0:39 and particles that can exist in two

0:41 places at once.

0:42 Newton gave us the

0:42 basics: force, motion, mass,

0:45 acceleration.

0:46 But centuries later, Einstein showed us time and space were

0:49 flexible, bendable, like cosmic rubber

0:51 sheets.

0:52 That's relativity.

0:53 The reason GPS has to correct for time differences

0:55 or it' send you to the wrong coffee

0:57 shop.

0:58 Then there's the bizarre world of

0:59 quantum physics where particles behave

1:01 like ghosts and probabilities.

1:03 You can't even say where something is until you

1:05 look at it.

1:06 It's like hideandsek with

1:07 subatomic gremlins.

1:08 And thermodynamics, that's the study of heat, energy, and

1:12 why your coffee gets cold if you talk

1:14 too long.

1:15 Altogether, physics is like

1:16 the source code of the universe, and

1:18 we've only hacked a tiny piece of it.

1:19 Chemistry is the part that builds the

1:21 universe's ingredients list.

1:22 Chemistry asks, "What is everything made of?

1:25 And how do those things interact, combine,

1:27 explode, or dissolve in soda?

1:29 It all starts with atoms.

1:30 Tiny particles made of protons, neutrons, and electrons.

1:34 They're like Lego blocks for reality.

1:36 Combine them in the right ways, and you

1:37 get everything from water to fireworks

1:39 to your favorite snacks.

1:40 Chemists study elements like hydrogen, oxygen, carbon,

1:44 and how they bond to make compounds.

1:46 Add hydrogen to oxygen, and boom, water.

1:48 Add carbon to hydrogen in different ways,

1:50 and you get gasoline, sugar, or plastic.

1:53 One of the most powerful tools in

1:55 chemistry is the periodic table.

1:57 A big colorful chart that's basically the

2:00 ultimate cheat sheet for how the

2:01 universe is built.

2:02 Chemistry explains why metal rusts, why soap works, why

2:05 fire burns, and why mentos and cola

2:07 causes a soda volcano.

2:09 It also dives into reactions when molecules change

2:12 partners, break up, or go full-on

2:14 explosive.

2:14 Some release energy like

2:16 fire.

2:16 Others absorb energy like instant

2:18 ice packs.

2:19 There's organic chemistry, which deals with carbon-based life

2:22 stuff, proteins, DNA, medicine, even

2:25 food flavors.

2:26 And inorganic chemistry, the non-living side, metals, rocks,

2:30 acids, weird glowing solutions in

2:32 science labs.

2:32 In short, chemistry is the

2:34 science of stuff, and it's everywhere.

2:36 In your kitchen, in your body, in your

2:38 shampoo, in the phone you're probably

2:40 holding right now.

2:41 Then come biology.

2:42 Biology asks the big question, what is

2:44 life?

2:45 How do living things grow, evolve,

2:46 survive, or just keep being alive?

2:49 It starts at the smallest level.

2:50 Cells.

2:51 Every living thing from a bacterium to

2:53 Beyonce is made of cells.

2:55 Some creatures are just one cell.

2:56 Others, like you are,

2:57 are made of 37 trillion.

2:59 Cells are little self-sustaining machines.

3:02 They eat, poop, breathe, reproduce, and call

3:05 the shots for your entire body.

3:07 Inside them, nucleus equals brain.

3:09 Mitochondria equals power plant.

3:11 Ribosomes equals protein shs.

3:13 Biology splits into branches like botany, plants, how they

3:16 photosynthesize, grow toward light, and

3:19 sometimes eat flies.

3:20 Zoology, animals, from insects with compound eyes to

3:24 whales with heartbeats as slow as a drum

3:25 beat.

3:26 Microbiology, the invisible life.

3:28 Bacteria, viruses, fungi, tiny stuff,

3:31 big impact.

3:32 Then comes genetics, the

3:34 instruction manual for life.

3:35 DNA is the four-letter code A, T, C, G, that builds

3:39 every organism.

3:40 Genes decide your eye

3:41 color, your height, and maybe even your

3:43 taste in pizza.

3:45 Evolution, that's biologyy's long-term game.

3:48 Natural selection helps living things adapt and

3:50 survive.

3:50 Like giraffes with longer necks

3:52 reaching more leaves equals more babies

3:54 equals more long necked giraffes.

3:56 Ecology looks at how living things

3:58 interact.

3:59 Predators chasing prey, bees

4:01 pollinating flowers, humans accidentally

4:03 messing everything up.

4:04 And don't forget human biology, organs, digestion, your

4:07 immune system fighting off the flu with

4:09 white blood cell warriors like not

4:11 today.

4:11 So whether it's studying the

4:12 brain, the rainforest, or the mold on

4:14 bread, biology is the science of life

4:16 itself.

4:17 Take a step outside, feel the

4:19 ground under your feet, that's Earth

4:20 science, the study of the only planet we

4:23 so far know has tacos.

4:25 Earth science is a combo pack.

4:27 Geology, meteorology, oceanography, and environmental science,

4:31 all working together to explain how our

4:33 planet ticks.

4:34 Start with geology, the

4:35 study of rocks.

4:36 Not just look at this

4:37 cool rock, but this rock is 3 billion

4:40 years old and used to be at the bottom

4:41 of an ocean.

4:42 Earth has layers and like a

4:43 cake, but molten and deadly.

4:45 Crust where we live.

4:47 Mantle, super hot peanut

4:48 butter.

4:49 Outer core, liquid metal.

4:50 Inner core, solid iron, hotter than the sun's

4:52 surface.

4:53 Plate tectonics explains earthquakes and volcanoes.

4:56 Earth's surface isn't still its puzzle pieces

4:59 constantly grinding and colliding.

5:01 India literally slammed into Asia and made the

5:03 Himalayas.

5:04 Yep, Mount Everest is a scar.

5:06 Now look up.

5:07 That's meteorology, the science of weather.

5:09 It asks, why is it

5:10 raining?

5:11 Why is it hot?

5:12 Why is there a

5:12 tornado warning during your beach day?

5:14 Air pressure, temperature, and water

5:16 vapor combine like ingredients in a

5:18 chaotic soup called the atmosphere.

5:20 Add a little global warming, and things get

5:22 spicy.

5:22 Oceanography dives into the deep.

5:24 The oceans cover 71% of Earth, hold 97%

5:28 of its water, and contain things we've

5:30 never even discovered.

5:31 Currents control climate.

5:32 Coral reefs house millions of

5:34 species.

5:35 And the deep ocean still more

5:36 mapped than your uncle's basement.

5:38 Finally, environmental science asks,

5:40 "How are humans messing up the planet?

5:42 And can we stop before we cook

5:43 ourselves?" From pollution to

5:44 deforestation to climate change, Earth

5:47 science doesn't just study the planet,

5:48 it protects it.

5:49 Because there's no planet B.

5:51 Next, computer science.

5:53 Computer science isn't just about

5:54 building robots or fixing your grandma's

5:56 Wi-Fi.

5:56 It's the science of how computers

5:58 think, how data flows, and how logic

6:00 rules digital worlds.

6:02 At its core, computer science is problem solving with

6:04 precision.

6:05 Want to tell a computer what

6:06 to do?

6:07 You have to be very, very

6:08 specific.

6:09 Like, take input A, multiply

6:11 it by B.

6:12 If the answer is bigger than C,

6:14 do X, otherwise do Y.

6:16 That's called an algorithm.

6:17 Not just a buzzword, but a

6:19 step-by-step recipe for solving

6:20 problems.

6:21 Baking cookies, that's an

6:23 algorithm.

6:23 Sorting your emails, algorithm.

6:25 Suggesting videos at 2 a.m.,

6:27 definitely algorithm.

6:28 Then there's programming languages, not English or

6:30 French, but Python, JavaScript, C++, and

6:34 more.

6:34 Each one speaks to computers

6:35 differently.

6:36 Python, simple and friendly.

6:38 C++, fast but picky.

6:40 JavaScript runs the internet.

6:42 Kind of chaotic.

6:43 Code is like poetry.

6:44 If poetry crashed when you forget a semicolon.

6:47 Let's zoom out to hardware versus

6:48 software.

6:49 Hardware equals the physical

6:50 stuff.

6:51 Chips, screens, keyboards.

6:52 Software equals the invisible

6:54 instructions that tell the hardware what

6:56 to do.

6:56 Ever heard of binary?

6:57 It's the deepest layer.

6:58 Computers speak only in

7:00 ones and zeros.

7:01 Yes equals 1.

7:02 No equals zero.

7:03 That's it.

7:03 All of the internet,

7:04 cat videos, maps, video games made of

7:07 tiny flickers of yes and no.

7:09 Magic?

7:09 Nope.

7:10 Just logic gates, transistors, and

7:12 electricity doing math at light speed.

7:14 Now we've got artificial intelligence

7:16 teaching machines to learn.

7:17 A I doesn't think like a human yet, but it can play

7:21 chess, write poems, recommend music.

7:23 Computer science isn't just screens and

7:25 code.

7:25 It's the language behind every

7:27 app, website, robot, game, and future

7:29 invention you can imagine.

7:31 And it all started with humans asking, can we teach

7:33 a rock to think?

7:34 If science is the

7:35 engine, math is the blueprint.

7:36 It's not just about numbers.

7:37 And it's the logic

7:38 that makes the universe tick.

7:40 From ancient times, humans used math to count

7:42 goats, measure land, and build pyramid.

7:44 I have three goats.

7:46 You have four goats.

7:47 Now we fight.

7:48 But math quickly grew

7:49 beyond counting.

7:50 Enter geometry, the art

7:51 of shapes, angles, and ancient Greek

7:54 flexing.

7:54 Uklid said, "Give me a straight

7:56 line, and I'll give you a theorem."

7:57 Pythagoras said, "A2+ B 2= C^2, unless

8:02 C is imaginary." Then came algebra,

8:04 math's version of hideand seek.

8:06 X is missing.

8:07 Go find it.

8:08 It sounds like torture until you realize algebra is

8:11 behind banking apps, 3D animation, and

8:14 launching rockets.

8:14 And we can't forget

8:15 calculus invented by Newton and Linets

8:17 at the same time.

8:18 Awkward.

8:19 It's math for things that move and change like

8:21 speeding cars, growing bacteria, or

8:24 stock market chaos.

8:25 It asks how fast is

8:26 this going and how much will there be?

8:29 And then actually answers.

8:31 Ever heard of probability and statistics?

8:33 That's math trying to predict the future.

8:35 Will it rain?

8:35 What are the odds of winning the

8:37 lottery?

8:37 Spoiler, not great.

8:38 Please don't.

8:39 And then there's pure math.

8:41 The deep mindbending stuff.

8:42 Prime numbers that go on forever.

8:44 Fractals that repeat endlessly.

8:46 Weird shapes with infinite

8:48 surface area and zero volume.

8:50 Mathematicians live for this.

8:51 They scream when a new theorem is proven.

8:53 Here's the twist.

8:54 Math is the same

8:56 everywhere.

8:57 A triangle in Tokyo has the

8:58 same angles as one in Timbuktu.

9:00 The equation for gravity works on Earth,

9:02 Mars, and wherever Elon Musk is going

9:05 next.

9:05 That's why we call it the

9:06 universal language.

9:07 No matter.