April 3-5 England's University of Leeds hosts the Science and Technology in Climbing and Mountaineering conference. It's serious business—the seminar lineup includes "Anthropometry of Young Competitive Sport Rock Climbers"—but it's good to know that the bunsen-burner set is roping up once in a while.

April 5-14 As ski season comes to a close, Aspen Mountain plays host to the 2nd annual 180 Spring Jam. Festivities include free concerts, pro competitions, and the Wild Dash for Cash, a free-for-all ski race over bumps, jumps, and snow walls; first to the finish line takes all.

April 7 Lance Armstrong plays domestique for US Postal Service teammate George Hincapie at the Tour of Flanders.

April 13-14 Tank top-adorned boarders carve the sand dunes of California's Mojave Desert at the Sand Master Jam 2002.

April 14-17 Eight sleek 60-foot yachts competing in the Volvo Ocean Race pound the waves of the eastern seaboard. The 875-nautical-mile run from Miami to Baltimore is the round-the-world regatta's sole American leg.

April 20-27 The 25th annual Wildlife Film Festival brings nearly 200 movies and videos to Missoula, Montana. Broadcaster David Suzuki will give the keynote speech.

April 21 PBS airs the documentary Ansel Adams, directed by Ric Burns (the brother of documentary legend Ken Burns). Coproduced by The Sierra Club, the 90-minute biopic honors the centennial of Adams's birth.

April 22 It's Earth Day. Bike to work. Compost. Stage an "action."

April 27 Forty-nine teams of masochists set off on a grueling 600-mile-plus course through the wilds of Vietnam in the Raid Gauloises, the adventure race that started them all.

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