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“The invention of the internal combustion engine in the 19th century has revolutionized transportation over land, water, and air.”

Bartosz Ciechanowskiciechanow.ski ↗

Ciechanowski starts with a hand crank and a cannon and ends with a working four-stroke engine you can spin in your browser. Every part moves, and every part is explained. Most engineering textbooks cost a fortune and teach less. One person with patience and JavaScript beats them, for free.