For two weeks, Motherboard writer Kate Lunau skipped her soap and deodorant—spritzing herself with a “live bacteria spray” instead. Her goal was to colonize her skin with ammonia-eating bacteria, which are supposed to neutralize the smell of sweat. There are a growing number of believers out there: Chemist David Whitlock, who came up with this, hasn’t showered in 13 years. But are live bacteria products really the future of skincare? And, maybe more importantly, how bad did Kate smell by the end of it?

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