Thrills, chills and spills: what keeps two daredevils safe on the slopes? World-class skills and an expert grasp of Physics. (Physical science: Newton's laws of motion).

Science World | January 10, 2003| | Copyright

Picabo Street is one of America's greatest downhill ski racers. She barrels down snowy slopes at speeds up to 80 miles per hour clad in little more than spandex and a helmet. "Speed is in my system," says Picabo (pronounced Peek-a-boo). "I drive fast, talk fast, ski fast." Her mastery of the sport has earned her an Olympic gold medal and 11 World Cup championship titles.

Rebel extreme skier Glen Plake doesn't compete for prizes or titles, but he may be the world's most recognized freestyle skier, thanks to gravity-defying stunts and a trademark 17-inch bleachblond ...

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