This battery-less piezoelectric toothbrush generates electricity every time you brush your teeth and removes more than 99% of plaque in lab tests
23
votes
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'Perfectly preserved' Neanderthal skull bones suggest their noses didn't evolve to warm air
18 votes -
High-altitude cave used by Tibetan Buddhists yields a Denisovan fossil
14 votes -
Why is it so hard to tell the sex of a dinosaur?
9 votes -
Quetzalcoatlus was the largest flying animal of all time. But only a handful of bones have been found. So how do scientists know what it looked like?
5 votes