The New York Times Agency Photos
SCI SKI PHYSICS
Ryan St. Onge, the men's aerial skiing world champion and an Olympic team member, at Utah Olympic Park in Park City, Utah in January 2010. Watching skiers hurtle off a curved ramp at 30 miles an hour, soaring six stories in the air while doing three back flips and up to five body twists, a simple first thought crosses the mind: These people are crazy. But keep watching and the thoughts become more complicated. (George Frey/The New York Times)