Harvard researcher Kit Parker built his academic career studying the heart. But Parker, also an officer in the U.S. Army Reserve, switched his focus to figuring out how IED blasts damage the brain.
"Nobody can soldier without coffee," a Union soldier wrote in 1865. (Above) Union soldiers sit with their coffee in tin cups, their hard-tack, and a kettle at their feet.
Lincoln Financial Foundation Collection/Flickr The Commons
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