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

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Once Denied A Purple Heart, A Soldier Gets Her Medal
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John Walker Lindh was captured in Afghanistan in 2002 after fighting with the Taliban. File Photo/AP hide caption

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John Walker Lindh Sues For Prison Prayer Group
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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

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Before Reaching War Zones, Troops Risk Concussions
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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

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Am I A Tissue Donor, Too?
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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

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Little Regulation Poses Problems Tracking Tissue
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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

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Calculating The Value Of Human Tissue Donation
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Coal miner Lee Hipshire in 1976, shortly after emerging from a mine in Logan County, W.Va., at the end of his shift. A few years later, Lee took early retirement because of pneumoconiosis, or black lung disease. He died at 57. Courtesy of Earl Dotter hide caption

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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

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Black-Lung Rule Loopholes Leave Miners Vulnerable
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Coal miners are tested for black lung at a clinic in West Virginia. David Deal for NPR hide caption

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As Mine Protections Fail, Black Lung Cases Surge
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