This past weekend, fifteen very lucky Florida science teachers experienced the thrill that only a few hundred astronauts have had -- flying in zero-gravity. The selected teachers were participants on the inaugural flight of the ZERO-G Learning Lab. G-FORCE ONE, the only commercial aircraft to offer zero-gravity flights, took off at 8:30 am (ET) Sunday, July 17, and flew 19 parabolas, giving its passengers more than ten minutes of weightlessness during the flight.