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Popular Mechanics
March 14, 2008
Glenn Harlan Reynolds
Spare Air Is Reverse Parachute of Scuba: Test Dive (With Video) Spare Air is a back up mini-tank with its own built-in regulator that holds just enough air to let you make a safe ascent when scuba diving. mark for My Articles similar articles
U.S. CPSC
March 29, 2006
Gear Up, Strap It On -- Helmets Can Save Lives and Reduce Injuries CPSC Releases New "Which Helmet for Which Activity" Guide mark for My Articles similar articles