🖼️ loading image…

Everything around you, your chair, your phone, the air, even you, is made of unimaginably tiny pieces called atoms.

For centuries, scientists assumed that tiny things follow the same rules as big things: a grain of sand should behave like a small football. Around the year 1900 they discovered they were wrong. When you zoom in far enough, nature plays by a completely different rulebook. That rulebook is called quantum physics.

Quantum physics is not just a curiosity. It explains why the Sun shines, why metals conduct electricity, and how lasers, LEDs, phone chips and MRI scanners work.

What you will learn

1. What "regular" (classical) physics says, and where it breaks down
2. Why energy comes in tiny packets called quanta
3. Why light is both a wave and a stream of particles
4. Why electrons and atoms behave like waves too
5. Superposition, measurement, uncertainty, tunnelling, spin and entanglement
6. How all of this powers technology you use every day

How this lesson works

• Each step explains one idea, and each idea builds on the one before it.
• Most steps have an interactive model. Play with it: the goal is to discover the idea yourself.
• No advanced maths. If you know that energy, speed and waves exist, you are ready.

Try it: zoom into matter

Drag the slider (or press Zoom in) to shrink down, step by step, from your own size to the heart of an atom. Watch the meter: at some point the familiar rules stop working.

Notice where the meter swings: somewhere between a virus and a single molecule, the everyday rules stop being enough. Everything in this lesson happens on the right side of that meter.

Key idea: quantum physics is the rulebook for the very small: atoms, electrons and light.