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The water in your glass has been round this loop countless times. Learn the four stages and close the loop yourself in an interactive playground.

Plants do not eat soil — they build their own food out of air, water and light. Learn what each ingredient actually does.

Every meal traces back to sunlight, and most energy is lost at each step. Learn why food chains are always short.

Removing one species rarely affects only that species. Learn how effects cascade through an ecosystem.

Solid, liquid and gas are not three kinds of stuff — they are three arrangements of the same particles. Learn what each arrangement does, in an interactive playground.

Every change of state is energy going in or coming out, and every one can be reversed. Learn what the particles do at each step.

Heat a glass of ice water and the temperature refuses to budge until every last piece has melted. Learn where that energy goes, in an interactive playground.

Dissolved salt looks gone but is still entirely there. Learn why dissolving is not melting, and recover the salt step by step.

Energy is not a substance with types — it is a quantity held in stores. Learn the main stores and build energy down into each one in an interactive playground.

Energy is never used up — it spreads out until it is too thin to be useful. Follow one battery worth of energy all the way to the end.

A force does not keep things moving; it changes how they move. Learn what that difference means, and build a force down to what it changes in an interactive playground.

A skydiver does not accelerate all the way down. Learn how growing drag brings forces into balance, and build the four stages.

A bulb lights only when charge has an unbroken path back to the battery. Build that loop yourself and find out exactly what one small break does.

Conductors and insulators are not about what a material is made of but about whether anything inside it is free to move. Sort four materials by that test.

A battery does not store electricity waiting to be used up. It holds chemicals, and it pushes. Build a battery down to what it does at each moment.

HTML is not about how a page looks — it is how you tell the browser what each piece of content actually is. Get that distinction and everything about web pages makes more sense.

There is no best programming language — only languages that fit particular jobs. Learn what each popular language is genuinely good at, and how professionals actually choose.

Learn how artificial intelligence is categorized based on its capabilities, from highly specialized tools to theoretical super-intelligence.

See how AI really learns — collect, clean, train, test, use — explained simply with an interactive workflow you build yourself.

AI's real strengths and blind spots explained simply — with an interactive playground where you sort abilities into what AI can and cannot do.