We call it waste, but there’s a lot of power in what we flush down the toilet. Creative designers have given us pee-powered gadgets and poo-powered vehicles, but that’s just the tip of the ice berg.
Engineers say they've developed microbial fuel cells that can produce up to 50 times more electricity directly from wastewater as previous efforts.
A huge increase in the number of minor earthquakes across the middle of the US is almost certainly caused by wastewater injection from oil or gas drilling, including the controversial technique known as fracking.
What would happen if you jumped into a lake and then, still wet, went swimming in the ocean?