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Many molecules essential to living organisms come in two asymmetrical forms, like your hands. Some scientists have started to wonder what might happen if someone tried to reverse life’s handedness and create a cell—probably a bacterium—that held a mirror to normal biochemistry. The answer is
potentially terrifying.
Speaking of bacteria: should you be using a tongue scraper? They’ve long been trendy; the Romans used them, as did the Founding Fathers. Today wellness-obsessed celebrities like Gweneth Paltrow swear by them. But our
Well Informed column
says there’s another tool that’ll do the job just as well. | 
