Everyday physics myths
Thirty-six everyday physics myths and half-truths — does a heavier object really fall faster, why is the sky blue, is there no gravity in space, and does the Coriolis effect...
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Floating point in JavaScript: binary fractions, rounding, and precision limits
Why 0.1 + 0.2 isn't 0.3, why toFixed sometimes rounds the wrong way, where negative zero comes from, what happens above Number.MAX_SAFE_INTEGER, and why adding the same numbers...
Game bugs that became features: Space Invaders, the Creeper and the Konami code
A slow processor gave Space Invaders one of the first difficulty curves. Minecraft's best-known monster is a broken pig. Fighting-game combos started as an accident, and the...
Game theory in awkward situations
Thirty-five questions on strategic behavior in everyday human situations — splitting the bill, replying late, group projects, salary talks, and office politics — using them to...
Git disaster recovery without panic
Thirty-three realistic Git recovery problems. Practice reading reflogs and saving lost commits, including work left on detached HEAD. Learn which undo command fits the...
Guess the CSS: flexbox and grid edition
Each Question shows a rendered layout. Can you tell which CSS produced it? Every picture is drawn from box sizes measured in a real browser. You'll work through the main axis...
Have you tried turning it off and on again? Real bugs a reboot hides
On The IT Crowd, a reboot is a joke. For the Boeing 787, it was an FAA order. Each Question looks at a real system that failed because it ran too long, from Windows 95 to a...
Hello, goodbye, and thank you around the world
A globe-trotting, slightly silly tour of the three phrases every traveller actually needs — hello, goodbye, and thank you — across 40-plus languages. Each question pairs the...
Hollywood hacking: real or nonsense?
Some movie hacks use real tools on real vulnerabilities. Others are technobabble written on deadline. Each Question takes a famous scene, whether a screen, a command or a line...
How mechanisms work: what happens when this turns?
Rotation goes in; something surprising comes out. A differential lets two wheels turn at different speeds while both are driven, a Geneva drive turns smooth rotation into...
How music works: waves, harmonics and why octaves sound the same
Why do two notes an octave apart sound like the same note? Why does a clarinet sound hollow? Why is a piano tuned slightly wrong on purpose? Most questions show a waveform, a...
How RAG systems retrieve, rank, and cite evidence
A practical quiz on how RAG systems chunk, retrieve, rank, cite, and evaluate information, and where they break. Each explanation links to a paper or technical doc.