C.U.L.T. Kids · The Worlds
Cultivating Underdeveloped Leaders Today
How things move. Why you stay on the ground. What energy is. The weird floor under everything we can see.
Why you do not fly off a planet spinning at a thousand miles an hour. Why the ball stops rolling — and why that took people two thousand years to get right. Why nothing you have ever touched has actually touched you. Ten things you can test today with a book, a coin, a ball and an ice cube, including four where the common belief is simply wrong.
The first mission is the one to keep: a belief nearly everybody holds can be tested in four seconds and turn out wrong, and the test is free. And the last one — Newton is not wrong, he is bounded. Knowing where a model stops working IS the expertise.
Physics is honest. It doesn't try to flatter you. The math is hard, the answers are weird, and the universe doesn't care what you'd prefer to be true. I came back to physics as an adult and finally appreciated how rule-bound the universe is — and how cool it is that we can write the rules on a postcard.
Energy, gravity, light, motion. Why a ball falls. Why the Sun shines. Why time goes slower if you go really fast. Physics is the rules underneath everything else.
Click any door. Each one has a question, a hook, and something to think about.
Hook: Energy never disappears. It just changes form. The energy in your sandwich was sunlight that hit a wheat field. The energy in sunlight came from the Sun fusing hydrogen.
Hook: Gravity is the weakest force in the universe. A magnet on your fridge is stronger than the entire Earth pulling on a paperclip. But at big scales, gravity wins.
Hook: Light is both a wave AND a particle at the same time. Scientists fought about which one for 200 years. Turns out it's both.
Hook: No. Time goes slower if you move really fast or if you're near something heavy. GPS satellites have to fix their clocks every day to account for this. Real, measurable, weird.
Hook: Yes. Atoms are 99% empty. The space between stars is mostly empty. The space between galaxies is even MORE empty. The universe is mostly nothing, with stuff sprinkled in.
Hook: Four. Gravity. Electromagnetism. Strong force (holds atom centers together). Weak force (radioactive stuff). Everything in the universe is some combination of these four.
Energy is the most important word in physics. It's what makes anything happen anywhere. Heat, light, motion, sound, electricity — all forms of energy.
The big rule: energy never goes away. It just changes shape. The chemical energy in your food becomes the kinetic energy of your muscles, which becomes heat, which radiates out into the air. Same energy, different form.
You are an arrangement of energy that's been moving around since the Big Bang. Same atoms. Same energy. Just rearranged through 13.8 billion years of changes to become you.
Anything that has mass pulls on anything else that has mass. The Earth pulls on you, and you pull on the Earth (just way less because you're way smaller). The Sun pulls on Earth, which is why Earth orbits it instead of flying off into space.
Gravity is the weakest of the four forces — magnets and electricity are way stronger at small scales. But gravity is always pulling, never pushing, and it adds up at big scales.
Albert Einstein figured out something even weirder: gravity isn't really a force. Mass bends space itself, and things "fall" because they're following the curve of bent space.
Light is the fastest thing in the universe. 186,000 miles per second. Nothing can go faster.
Light is also both a wave and a particle. When you do experiments to test if light is a wave, it acts like a wave. When you test if it's particles, it acts like particles. Same light. Different experiments. Both right.
The light from the Sun takes 8 minutes to reach you. The light from the closest star (besides the Sun) takes 4 years. The light from the Andromeda galaxy takes 2.5 million years. When you look up at night, you're seeing the past.
No, and this is one of the weirdest things in all of physics. Time goes slower when you move fast or are near heavy things.
The GPS satellites in space have to correct their clocks because being away from Earth's gravity makes their time tick slightly faster than yours. Without correcting, GPS would be wrong by miles every day.
If you flew to a star and back at almost the speed of light, you might experience 5 years of travel while 50 years passed on Earth. You'd come back younger than your siblings. This is real physics, not science fiction.
Atoms are mostly empty. If you scaled an atom up to the size of a football stadium, the nucleus would be a marble in the middle and the electrons would be tiny dust specks at the seats. Everything in between is empty.
You are mostly empty space. So is your phone, your chair, the wall you're leaning on. Why do solid things feel solid? Because the electrons in your hand repel the electrons in the chair, and that repulsion is what feels like "touching."
You never really touch anything. Electromagnetism touches it for you.
Four. That's it. Every single push, pull, attraction, repulsion in the universe is one of these four:
Gravity — what makes you fall, what holds the moon to Earth, what shapes galaxies. Weakest force, but always pulling, infinite range.
Electromagnetism — what makes light, electricity, magnets work. What makes "touching" feel like touching. Way stronger than gravity at small scales.
Strong nuclear force — what holds protons and neutrons together inside an atom. Strongest force, but only works super close up.
Weak nuclear force — what makes some atoms break apart and become other atoms (radioactive decay). Why the Sun shines, actually.
That's it. Everything is made of these.
Each lesson has one question, one thing to look at, and one thing to try. No special equipment.
Question: Where does the energy in your breakfast end up?
Look at: Anything plugged in. Lamp = electric energy → light energy + heat. Toaster = electric → heat. Phone = electric → light + sound + heat.
Try: Eat a snack. Then run for 30 seconds. The food's chemical energy just became motion energy and heat.
Question: Do heavy things fall faster than light things?
Look at: Drop a book and a piece of paper at the same time. The book lands first.
Try: Now ball up the paper into a tight wad and drop them again. They land at the same time. Air resistance was slowing the flat paper, not gravity.
Question: What does light actually look like?
Look at: Sunlight through a CD or DVD — you'll see a rainbow. That's light acting like a wave.
Try: Point a TV remote at your phone's camera while pressing buttons. You'll see a flashing dot the camera detects as particles. Same light, different behavior.
Question: What if you could fly really fast?
Look at: A clock. Imagine a clock on a spaceship going 99% the speed of light. It would tick about 7 times slower than yours.
Try: Stand still and think hard. Right now, your time is going slightly different from a friend in a different city, and slightly different from a satellite overhead. Time is not universal.
Question: Are you really touching anything?
Look at: Press your hand on a table. Press harder. The "solidness" you feel is electron repulsion.
Try: Imagine your hand and the table are both 99% empty space. The empty space is meeting empty space, with electrons pushing back on each other.
Question: Which forces are working on you right now?
Look at: All four. Gravity (you're sitting). Electromagnetism (your phone screen, your nerve signals). Strong force (the atoms in your body holding together). Weak force (carbon-14 in your body slowly decaying).
Try: Notice that all four are running in your body simultaneously, all the time, for free.
All four branches connect. Physics shares with all of them.
14 days on how things move, and the weird floor underneath everything you can see. Daily Beacon below.
This planet is one stop on a single curriculum, not a standalone topic. The same subject is taught at every level of C.U.L.T. — a cadet who starts at Sparks never starts over.
Every level is open to everybody. Nobody is asked their age, and nobody is tracked. A grown adult who never got taught this is welcome to start at the bottom rung, and a twelve-year-old who is ready is welcome to climb.