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Every lesson is one question Nib draws while he talks it through: watch it, or read it as a page. A series is a few lessons in order, on one bigger question.
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Most watched
The lessons and series people play the most.
How things work
Light, heat, sound, magnets and machines: the physics and chemistry under everyday things.
1 series · 36 lessons
Series · 6 parts
Why is the sky blue, and sunsets red?
The sky is blue because air scatters short waves of light, such as blue, far more strongly than long waves, such as red, and sends that blue to your…
▶ Play Why is the sky blue, and sunsets red?Read Why is the sky blue, and sunsets red?
Earth and space
Oceans, volcanoes, the seasons, the sky and the stars beyond it.
1 series · 24 lessons
Series · 8 parts
What is a black hole, and what would happen if you fell in?
A black hole is a region of space where gravity is so strong that nothing, not even light, can get out. It forms when the core of a very massive star…
▶ Play What is a black hole, and what would happen if you fell in?Read What is a black hole, and what would happen if you fell in?
Living things
Bodies, brains, plants and bees: how life works.
18 lessons
Computers and AI
What chips, algorithms and language models actually do, and the big questions about AI.
4 series · 25 lessons
Series · 6 parts
How can 20 guesses find one number in a million?
Because every guess can throw away half of what is left. Guess the middle of the range and the answer “higher” or “lower” removes half the numbers at…
▶ Play How can 20 guesses find one number in a million?Read How can 20 guesses find one number in a million?
Series · 8 parts
How do AI language models like ChatGPT actually work?
A chatbot such as ChatGPT is a very large text predictor. It reads your message as numbered chunks of text called tokens, and it writes its reply by…
▶ Play How do AI language models like ChatGPT actually work?Read How do AI language models like ChatGPT actually work?
Series · 6 parts
What is dynamic programming, really?
Dynamic programming is a way of solving a big problem by solving each smaller problem inside it exactly once and remembering the answer. It helps whe…
▶ Play What is dynamic programming, really?Read What is dynamic programming, really?
Series · 6 parts
Why can’t AI count the r’s in “strawberry”?
A chatbot never receives the letters of your question. Before any thinking happens, your text is chopped into pieces called tokens and each piece is…
▶ Play Why can’t AI count the r’s in “strawberry”?Read Why can’t AI count the r’s in “strawberry”?
Math
Numbers, shapes and patterns, drawn until they make sense.
12 lessons
History and society
Turning points, empires and markets, and why they went the way they did.
1 series · 21 lessons
Series · 6 parts
How did the printing press take over Europe in fifty years?
Within about fifty years of Gutenberg’s first printed books in the 1450s, presses had operated in more than 250 European towns. The spread was not a…
▶ Play How did the printing press take over Europe in fifty years?Read How did the printing press take over Europe in fifty years?
Stories, art and ideas
Novels and films, philosophy, words, and the craft of making things.
14 lessons
More to explore
The questions that don't fit a topic yet.
6 lessons