Investigations

Simon Cho competes in the men's 500-meter finals at the 2011 ISU World Cup short track speedskating final in Dresden, Germany. He won the event. Robert Michael/AFP/Getty Images hide caption

Retired Army Major Michelle Dyarman holds the Purple Heart medal she was awarded after suffering a severe concussion from an IED in Baghdad in 2005. Robb Hill for NPR hide caption

John Walker Lindh was captured in Afghanistan in 2002 after fighting with the Taliban. File Photo/AP hide caption

A training session for instructors who teach hand-to-hand combat, or combatives, at the Fort Benning military base in Georgia. Pouya Dianat for NPR hide caption

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. iStockphoto.com hide caption

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

Chris Truitt holds a photo of his daughter, Alyssa, who died when she was 2, at his home in De Forest Wis. After donating her organs and tissues, he decided on a career change that made him rethink tissue donation. Narayan Mahon for NPR hide caption

Coal miners are tested for black lung. Recently, the deadly disease has been discovered in younger miners and at more advanced stages. David Deal for NPR hide caption