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Continue reading →: Aerosols are a bigger coronavirus threat than WHO guidelines suggestWhen someone coughs, talks or even breathes, they send tiny respiratory droplets into the surrounding air. The smallest of these droplets can float for hours, and there is strong evidence that they can carry live coronavirus if the person is infected. Until this week, however, the risk from these aerosols…
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Continue reading →: Ancient microbial life used arsenic to thrive in a world without oxygenBillions of years ago, life on Earth was mostly just large slimy mats of microbes living in shallow water. Sometimes, these microbial communities made carbonate minerals that over many years cemented together to become layered limestone rocks called stromatolites. They are the oldest evidence of life on Earth. But the…
