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After air is pumped from a vacuum tube, a few gas molecules can still linger. Barium reacts with those leftovers, trapping them so the tube can work without being perfectly empty. It’s less a perfect vacuum than a room with an excellent cleanup crew.
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Scrape ferrocerium and it sheds tiny fragments that ignite when they meet air. Those burning bits are the sparks—not metal simply glowing from friction. The…
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Fresh, pure calcium would be a shiny, silvery metal. But it reacts quickly with air and water, changing its surface before you’re likely to see that gleam. In…
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Copernicium may be reluctant to bond with other atoms, according to calculations, because its enormous nuclear charge changes how its electrons behave. That…
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Bend indium and tiny patches inside it shift against one another. Those movements shake the surrounding metal, sending vibrations through it until they reach…
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Aluminum quickly grows a thin oxide layer when exposed to air. That invisible coating keeps oxygen and water from reaching most of the metal underneath;…
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