A build up of intestinal gases isn't just an etiquette problem — it's also linked to conditions like irritable bowl syndrome. So researchers have created a swallowable capsule packed with sensors that's able to measure the concentration of gases inside a patient, and wirelessly relay that info back to a smartphone app.
The best battery is one that lasts forever. The runner-up is one that charges because you're using the device it powers. And Australian researches are trying to make the latter a more mainstream reality.