Bronze medalist Arnu Fourie of South Africa (from left), gold medalist Jonnie Peacock of Great Britain, silver medalist Richard Browne of the United States and Oscar Pistorius of South Africa cross the line in the Men's 100m - T44 Final at London's Olympic Stadium.
Jamie McDonald/Getty Images
In a surprise finish, Brazil's Alan Fonteles Cardoso Oliveira (left) races past South Africa's Oscar Pistorius to win a gold medal in the 200-meter race at the 2012 London Paralympic Games.
Tatyana McFadden has won medals at the Paralympic Games in 2004 and 2008. At this year's games in London, she's participating in every wheelchair race from the 100-meter sprint to the marathon.
Courtesy of Deborah McFadden
Unlike organs, tissue doesn't need to be transplanted immediately. Storage facilities like Tissue Banks International in San Rafael, Calif., process and store donated tissue for later use in medical products or as transplants.