Virginia Tech's football helmets are outfitted with six sensors (the brown objects) that record data. There is also a small antenna that transmits information from the sensors to the sideline controller unit. The sensors are small accelerometers -- similar to devices that trigger an automobile air bag.
Courtesy of Dr. Gunnar Brolinson of Virginia Tech
Katherine Hamilton during a 1981 hurdles race when she was a sophomore at Berkeley. Later that year, Hamilton quit the team and walked away from her sport, largely because of the prevalence of performance-enhancing drugs at the top levels of track and field.
Courtesy of Martha Edwards
LeBron James announces his decision during a primetime special hosted by ESPN's Jim Gray on Thursday night at the Boys & Girls Club of America in Greenwich, Conn.
Larry Busacca/Getty Images