This guy quietly built the best physics textbook on the internet, and he gives it away for free.
His name is Bartosz Ciechanowski.
He is an ex-iOS engineer who writes interactive articles about physics, math, and engineering as a weekend hobby.
The site is called ciechanow.ski.
Open the article on the Mechanical Watch. Drag the watch to spin it. Pull a slider and the case peels away so you can look inside. Wind the mainspring by hand. Slow down time and watch the escapement click, the balance wheel breathe, the date wheel turn.
Nothing is a video. Everything is a live 3D simulation running in your browser tab.
He has done this for:
→ The Moon and its tides
→ GPS satellites
→ Gears and mechanical watches
→ The internal combustion engine
→ Bicycles and how they stay upright
→ Cameras, lenses, and light
→ Sound waves
→ Airfoils and how planes fly
Every article is thousands of words long with dozens of hand-coded interactive diagrams.
He writes them alone in his spare time. He publishes only a few per year. In his own words, he wants to keep the content accessible to everyone without ads or paywalls.
No publisher. No university. No company behind him.
One person is quietly shipping better science education than most universities charge tens of thousands a year for.
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