A University of Maryland team tries to create a person-powered helicopter that can reach an altitude of at least three meters and hover for at least 60 seconds.
University of Maryland students David Chang, left, and Ben Woods, far right, help make last-minute checks as pilot Judy Wexler prepares to test a human-powered helicopter. If successful, the team would be the first to win a contest established more than 30 years ago. At stake: $250,000. Matt McClain/FOR THE WASHINGTON POST Buy Photo