Researchers used cotton swabs to sample bacteria and other microbes from the skin of donated corpses placed in a field in Huntsville, Texas. Katie Hayes Luke for NPR hide caption

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Martin Luther King Jr., with his wife, Coretta, at a Harlem hospital after he was stabbed by Izola Ware Curry in 1958. AP hide caption

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Maria Fabrizio for NPR

Go on, guess what it's about. Marvel hide caption

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Tattoo artist Peter van der Helm, shown in his studio in Amsterdam in December 2013, has set up a business to preserve the tattoos of the dead. Michael Kooren/Reuters/Corbis hide caption

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