Hydrogen is just about the cleanest fuel you can imagine: The only exhaust it produces is water. A simple way to produce hydrogen is electrolysis, which uses electric current to split hydrogen and oxygen atoms in water molecules apart. To do that, researchers stick two metal plates connected to a

Prehistoric Egyptians practised mummification well before the time of the Pharaohs, suggests an analysis of resin-soaked linen. A team of Australian and British researchers investigated samples of wrappings taken from bodies found in the earliest known ancient Egyptian cemeteries — 4500 BC to 3350