Hydrogen-powered 'rocket car' tops 400 mph in record-breaking test (video)

Is it a rocket car? Tearing across the Utah desert at over 400 mph (644 kph), a hydrogen-powered car has set a new land speed record. Wing Commander Andy Green, a retired British Royal Air Force fighter pilot, just set a new world land speed record at the Bonneville Salt Flats in the JCB Hydromax vehicle. On two different runs on Aug. 11, the car went 400.623 mph (644.740 kph) and then 412.135 mph (663.267 kph), which averages out to 406.320 mph (653.909 kph). That's the fastest that any car wit