"Bob is the top of the top in tissue engineering, " says Bruce Hamilton , director of bioengineering and environmental systems at the National Science Foundation.

FORBES: Innovators

"There's not a way to legislate against sleepiness, " said Bruce Hamilton, manager of research and communications at the AAA Foundation for Traffic Safety, which instead focuses on public education campaigns and issuing brochures advising on the dangers.

WSJ: Drowsy driving remains an elusive highway dilemma