August 16, 2005The Net telephony upstart has a cult following, but the challenge is going to be shedding its geeky image.TAGS:Skype, professor, hype, challenge, telephony, VoIP, P2P, PC
August 4, 2007NASA thinks so, and it's offering prize money for teams heading to the skies in a contest starting Saturday.TAGS:aircraft, plane, biodiesel, contest, vehicle, challenge
August 14, 2007NASA contest tests the efficiency and economy of experimental small-seat airplanes for use as a personal aircraft vehicle.Photos: Commuters in the skyTAGS:airport, aircraft, plane, sky, efficiency, mile, challenge, car, idea
May 5, 2006Entrepreneurs are invited to build spacecraft that can simulate landing on the moon, in a $2.5 million contest hosted by the agency and X Prize. TAGS:moon, spacecraft, contest, vehicle, agency, winner, challenge
October 23, 2007For the third year in a row, no team rises to the challenge of building a robotic climber and a vertical tether that could one day comprise a workable space elevator.TAGS:tether, elevator, tycoon, material, challenge, laser, battery