English engineer John Smeaton invents modern concrete while looking for a material that would not degrade in water.
1839: Charles Goodyear drops gum on a hot stove, discovering vulcanization and, ultimately, weatherproof rubber. The first product: ruffled shirts for men.
1856: Henry Bessemer patents a process for melting low-carbon iron into a better quality steel that can be mass-produced.
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.
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