Four researchers came together to discuss what it takes for top athletes to run a marathon in under 2 hours.
Sochi's elevation makes speed-skating world records unlikely.
Less than eight percent of Bolt's energy contributed to his motion during the 100 meters at the 2009 World Championships.
David Rudisha's world record 800-meter performance, and a look ahead to the women's final.
Analysis suggests the likelihood of future world-record-breaking performances.
Research shows that the answers to a sleepiness questionnaire can predict how long an athlete will remain on his team.