The Belgian flag flies at half-mast at the Koningin Astrid-Reine Astrid military hospital in Brussels on March 24, 2016. Some of the people wounded in the Brussels attacks are being treated there. Patrik Stollarz/AFP/Getty Images hide caption

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U.S. Fish and Wildlife Forensics Lab Director Ken Goddard holds a wood sample used in the lab's forensic work in Ashland, Ore. Jes Burns/OPB/EarthFix hide caption

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Wildlife Forensics Lab Uses Tech To Sniff, Identify Illegal Wood
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Dallas Mildenhall, New Zealand's forensic pollen expert, peers at samples through a microscope. Courtesy of David Wolman hide caption

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Solving Crimes With Pollen, One Grain Of Evidence At A Time
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Knight (left) and Bucheli take soil samples from beneath one of the decomposing bodies. Katie Hayes Luke for NPR hide caption

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Could Detectives Use Microbes To Solve Murders?
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A Thai medic checks bodies for forensic identity in Phang Nga province in southern of Thailand on Jan. 11, 2005. Thousands of people were killed in Thailand after a massive tsunami struck on Dec. 26, 2004. Pornchai Kittiwongsakul/AFP/Getty Images hide caption

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After Disasters, DNA Science Is Helpful, But Often Too Pricey
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