fuel-cell cars run on hydrogen. The only waste products are clean water and heat.

Say goodbye to the internal combustion engine. The fuel cell is a new kind of engine without any moving parts.

It all sounds very Science Fiction and it is therefore approriate that fuel cells have been around at Nasa since the 1960s.

Like batteries, fuel cells make electricity from chemical reactions. A fuel cell has positive and negative terminals with the anode and cathode being separated by a polymer membrane electrolyte.

Afuel cell running on hydrogen produces just one waste product, which is pure clean water.

Fule cells are being planned for use not only in cars and other forms of transportation, but also to provide electricity for homes and offices.