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200 Years Ago, Faraday Invented the Electric Motor

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Born in 1791, he received only a barebones education at church school in his village of Newington, Surrey (now part of South London). While reconstructing Ørsted's experiments, Faraday was not entirely convinced that electricity acted like a fluid, running through wires just as water runs through pipes. The next day, he got it right.

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A New Wildfire Watchdog

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A hundred years ago, centimeter-scale tilt switches used a conductive blob of mercury rolling along a glass tube to close an electric circuit. The MEMS version, of course, is only a few millimeters in size, and instead of mercury, it uses a suspended block of silicon. Top: David Little/The Mercury News/Getty Images; Bottom: PurpleAir.

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Will an EV-Filled World Pass The Sulfuric Acid Test?

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In 1894, a German chemist named Herman Frasch plotted a process of tapping a sulfur-containing mineral deposit by pumping it with superheated water. The minerals that contain sulfur often also tend to contain toxic metals like mercury, arsenic, and thallium. The sulfur will melt and bubble up to the surface.

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