Zach Sayne at age 5, with his mother Nola. Courtesy of Nola Sayne hide caption

itoggle caption Courtesy of Nola Sayne

Ernie Lopez hugs his daughter, Nikki Lopez. He was released from prison on March 2, 2012, in Amarillo, Texas, after serving nine years. Katie Hayes Luke for NPR hide caption

itoggle caption Katie Hayes Luke for NPR

Jennie and Kristian Aspelin pose in a pumpkin patch with their children two weeks before three-month-old Johan died. Courtesy of the Aspelin family hide caption

itoggle caption Courtesy of the Aspelin family

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 hide caption

itoggle caption 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. Emilio Morenatti/AP hide caption

itoggle caption Emilio Morenatti/AP

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 hide caption

itoggle caption Courtesy of Deborah McFadden

Stephen Strasburg of the Washington Nationals pitches against the Atlanta Braves at Nationals Park last week. Patrick McDermott/Getty Images hide caption

itoggle caption Patrick McDermott/Getty Images

Organ and tissue donation forms vary from state to state. Some are very general, while others allow people to choose or restrict what they want to donate. hide caption

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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. Noah Berger/AP hide caption

itoggle caption Noah Berger/AP