On January 21, 2008, Mallory Weggemann received an epidural injection to help treat back pain. But an error in the medical procedure left the 18-year-old paralyzed from the waist down. Mallory, who had been a swimmer since the age of seven, thought her competition days were over. Just a few months later, she attended the Paralympic Swimming Trials held at the University of Minnesota Aquatics Center. The following Monday, she returned to the pool. See her story, in this profile from Medal Quest.