Lessons
Step-by-step lessons in six tracks, from unplugged games to real Python code.
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Robots at Work and in Space
Meet robot vacuums, factory arms and a Mars rover, and find out why a robot far from home must make…
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Design Your Own Robot
Invent a robot of your own, choose its sensors and actions, and write its rules as a flowchart.
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What’s Inside a Computer?
Meet the processor, memory, storage and the input and output parts of a computer by imagining a busy kitchen.
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Counting with Light Bulbs
Learn binary, the on-and-off number system that every computer uses, by switching imaginary light bulbs on and off.
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Secret Codes in Binary
Find out how a computer turns letters into numbers and then into bulb patterns, and decode a secret message.
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Pixels and Colour
Discover that a screen is made of tiny dots of red, green and blue light, and mix them with numbers…
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How Pictures Are Stored
Turn a picture into a grid of numbers, then shrink it with a clever counting trick called run-length encoding.
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Logic Gates
Meet AND, OR and NOT, the tiny decision-makers inside every computer chip, and write their truth tables in Python.
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Bits, Bytes and Memory Sizes
Learn what bits, bytes, kilobytes, megabytes and gigabytes mean, and how much a phone or computer can store.
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How the Internet Works
Follow a message as it is chopped into packets, passed along by routers and put back together, just like a…
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Searching and Sorting Fast
Find things lightning fast with binary search, and see why putting things in order makes searching so much quicker.
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Staying Safe and Kind Online
Learn simple habits for keeping private things private, thinking before you share, being kind, and knowing when to ask a…