This rocket car shot along at 90 miles an hour on a different sort of alternative fuel: liquid oxygen. The driver ended up being killed in an explosion at a later trial, but its inventor insisted that the successful first run proved "the scientific possibility of driving vehicles this way."
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Five amazing, clean technologies that will set us free, in this month's energy-focused issue. Also: how to build a better bomb detector, the robotic toys that are raising your children, a human catapult, the world's smallest arcade, and much more.