Home > Newsletters > Daily: Love or hate Earth Hour? > Daily Dose: Poo now in pill form to treat gut infection > Health-in-Motion 12 October 2016 Non-toxic batteries Medical visionaries believe that we’re not far from the day when doctors will routinely give us edible electronic devices to swallow which will diagnose or even treat various diseases. But how does one power these tiny machines without having to worry about how long they’ll survive in the body and whether they are potentially poisonous? One team of scientists is making progress with edible, non-toxic batteries made out of melanin pigments which occur naturally in the skin, hair and eyes. These devices would simply dissolve after having done their job. 0 More: Daily Dose: Poo now in pill form to treat gut infectionHealth-in-Motion advertisement Other news Medical SA researchers find urine test better for rapid TB testing Medical SEE:7 of the world's most famous TB patients Medical TB patients dying without dignity as drug resistance soars Medical Diabetes: You can have a cheat meal and stay healthy Lifestyle Oil foils: your skin-care guide for acne-prone skin Medical SEE: How long should a cough last? From our sponsors How to care for your vaginal flora Live healthier Hello? » SEE: Interesting facts about hearing loss Earworms: Let it go Is it bad to sleep with earplugs all the time? SEE: Do women hear better than men? The reason why men often appear not to be listening could be because they actually can't hear you. Confident smile? » Acidic drinks can harm your kids' smiles The facts on bleaching your teeth Am I taking good care of my teeth? Why are my teeth stained? We know the rules – brush your teeth twice a day and floss to keep them healthy. But, have you ever wondered what causes those stains that sometimes appear?