Toshiyuki IMAI/Flickr (CC BY SA 2.0)

Could your stomach be a battery for ingestible devices?

How do you create a battery from two strips of metal? Just add acid—stomach acid in this case. Hoping to find a safe way to power ingestible medical devices like electronic drug-release capsules and cameras, scientists have turned the stomachs of living pigs into batteries that can power ingestible thermometers, Cosmos magazine writes. The juice was able to run the thermometer for 7 days and transmit temperature readings every 12 seconds, the scientists report in Nature Biomedical Engineering.