Engineering

Every engine type — four-stroke, two-stroke, diesel, Stirling, Wankel, steam — animated with the parts labelled while they move, and a speed control so you can slow the cycle to a crawl.

Long interactive essays on gears, mechanical watches, internal combustion engines, GPS, cameras and light. Every figure is a working toy, and the depth is closer to a textbook chapter than a blog post.

Animated explanations of mechanical and electrical systems one machine at a time — gearboxes, differentials, transformers, turbines — with the cutaway view doing most of the teaching.