For the first time since its introduction in 1980, the $250,000 Sikorsky Prize for a human-powered helicopter flight has actually been awarded.
Engines are overrated. The Gamera human-powered helicopter managed its first flight with a record-setting attempt at the University of Maryland.
NASA conducts a dramatic test of new helicopter safety equipment by dropping a fuselage full of dummies and capturing it all on video.
Zero's electric bike takes some getting used to. The benefits? Forty miles on a single charge and no stopping at the pumps. Photos: Motorbikes go green