While most of us will never bear witness to them, many of the world's smallest organisms have some incredible means of survival. Some soil bacteria, for example, can gobble up hydrogen from the air and use it for fuel if starved of any other food. It's exactly this microbiological trickery that set researchers from Monash University in Australia on a long path to locating and isolating an enzyme from Mycobacterium smegmatis that processes the consumed hydrogen and outputs it as electricity. Now, this has the potential to be harnessed for use to power things such as small devices and implants.