The fuel cell uses hydrogen and oxygen to produce electricity, and the only by-products are water and heat. So why aren't they more in use? The Next Big Thing? looks at the history of other promising technologies to answer that question.
[text adapted from kikim.com]
Written by Mark Page
Directed and Produced by Bill Jersey
Edited by Aaron I. Butler
Music by Marshall Crutcher
Produced by Kikim Media and Quest Productions for PBS