Lori Baker with her husband, Erich. Baker is founder and executive director of the International Consortium for Forensic Identification, Reuniting Families Project. StoryCorps hide caption

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Doctors used a rapid DNA test to identify a Wisconsin teen's unusual infection with Leptospira bacteria (yellow), which are common in the tropics. CDC/Rob Weyant hide caption

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Being able to insert the two man-made letters into DNA, alongside the usual four-letter alphabet, could teach old cells new tricks and lead to better drugs, researchers say. courtesy of Synthorx hide caption

itoggle caption courtesy of Synthorx

Up till now, all babies have had two genetic parents. That could soon change. Klöpper & Eisenschmidt GbR/iStockphoto hide caption

itoggle caption Klöpper & Eisenschmidt GbR/iStockphoto

Love your hair. Artists' depictions of a Neanderthal man and woman at the Neanderthal Museum in Mettmann, Germany. Martin Meissner/AP hide caption

itoggle caption Martin Meissner/AP

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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A technician loads patient samples into a machine for testing at Myriad Genetics in Salt Lake City in 2002. The Supreme Court ruled Thursday that Myriad cannot patent the BRCA genes, which are tested to check a woman's risk for breast and ovarian cancer. Douglas C. Pizac/AP hide caption

itoggle caption Douglas C. Pizac/AP

Gov. Phil Bryant, at the Teenage Pregnancy Prevention Summit in Jackson, Miss., in 2012, supports a controversial effort to identify men who impregnate teen girls. Rogelio V. Solis/AP hide caption

itoggle caption Rogelio V. Solis/AP

A micrograph of HeLa cells, derived from cervical cancer cells taken from Henrietta Lacks. Tomasz Szul/Visuals Unlimited, Inc./Getty Images hide caption

itoggle caption Tomasz Szul/Visuals Unlimited, Inc./Getty Images