Researchers made a battery you can eat that will power an edible robot

At some point in the not-too-distant future, a doctor might instruct you to swallow a robot you can eat to deliver some sort of therapy with incredible precision or perform some kind of test. You’ll probably do it without thinking twice, knowing that all of the robot’s components are made of food.

You’ll also be able to eat (well, digest) the battery without worrying about any other chemical reactions or side effects involving electric-powered machines that inhabit your body briefly.