After hybrid success, Toyota gambles on fuel cell

Rocket science long dismissed as too impractical and expensive for everyday cars is getting a push into the mainstream by Toyota, the world's top-selling automaker.

Buoyed by its success with electric-gasoline hybrid vehicles, Toyota is betting that drivers will embrace hydrogen fuel cells, an even cleaner technology that runs on the energy created by an electrochemical reaction when oxygen in the air combines with hydrogen stored as fuel.