There's now medicine that knows whether you're following the doctor's orders, said Stephanie M. Lee at BuzzFeed. Silicon Valley's Proteus Digital Health makes a "smart pill" that wirelessly alerts an app after it's been swallowed. The pill uses "digestible sensors" made from copper and magnesium that react with stomach acid "to send a tiny electrical signal," which is picked up by a Band Aid–like patch worn on the skin.
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