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QLEDs â light-emitting diodes that rely on nanocrystals called quantum dots â are usually made with toxic heavy metals. A strategy has been developed to make QLEDs with a performance comparable to that of commercially available technologies but using a more environmentally friendly alloy of zinc, selenium, telluriu
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Who were the Denisovans? Rich trove of fossils and tools paints new picture
4+ day, 22+ hour ago (17+ words) Objects found in a cave in southwestern China suggest that these enigmatic ancient humans were accomplished hunters....