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Football rules, uniforms, helmets and protective gear have changed a lot over the years. Keystone-France/Gamma-Keystone via Getty Images hide caption

itoggle caption Keystone-France/Gamma-Keystone via Getty Images

Think of human relationships as entanglements. How do they bind you; how do they reveal who you really are? Daniel Horowitz for NPR hide caption

itoggle caption Daniel Horowitz for NPR

Harvard University student Elana Simon introduces President Obama before he spoke at the White House Friday about an initiative to encourage research into more precise medicine. Mandel Ngan/AFP/Getty Images hide caption

itoggle caption Mandel Ngan/AFP/Getty Images

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Augustine Goba (right) heads the laboratory at Kenema Government Hospital in Sierra Leone. He and colleagues analyzed the viral genetics in blood samples from 78 Ebola patients early in the epidemic. Stephen Gire/AP hide caption

itoggle caption Stephen Gire/AP

Cleveland Clinic pharmacist Katie Greenlee talks with Morgan Clay about how he should take his prescriptions when he leaves the hospital. Sarah Jane Tribble/WCPN/Ideastream hide caption

itoggle caption Sarah Jane Tribble/WCPN/Ideastream

Lori Lomas, an insurance agent with Feather Financial in Quincy, Calif., has noticed that her clients in San Francisco have many more health carrier options than her mountain neighbors. Pauline Bartolone for KXJZ hide caption

itoggle caption Pauline Bartolone for KXJZ

A couple of male, genetically modified Aedes aegypti mosquitoes take flight. Dr Derric Nimmo/Oxitec hide caption

itoggle caption Dr Derric Nimmo/Oxitec

Research into how the human brain develops helps explain why teens have trouble controlling impulses. Leigh Wells/Ikon Images/Corbis hide caption

itoggle caption Leigh Wells/Ikon Images/Corbis

A hospital bed is draped with a flag after a veteran died in the hospice ward at St. Albans VA in Queens, N.Y. Quil Lawrence/NPR hide caption

itoggle caption Quil Lawrence/NPR

Rhett Krawitt, 6, outside his school in Tiburon, Calif. Seven percent of the children in his school are not vaccinated. Courtesy of Carl Krawitt hide caption

itoggle caption Courtesy of Carl Krawitt

A marijuana bud displayed in Denver. Don't legalize pot, the pediatricians say, but don't lock teenagers up for using it, either. Seth McConnell/The Denver Post/Getty Images hide caption

itoggle caption Seth McConnell/The Denver Post/Getty Images

High school athlete Graham Hill, number 50, suffered a concussion in 2013 while playing football at Trinity Christian Academy in Addison, Texas. Courtesy of Jeffrey McWhorter hide caption

itoggle caption Courtesy of Jeffrey McWhorter

Ultrasound is often used for prenatal screening. It's just one of several prenatal screenings available to pregnant women. iStockphoto hide caption

itoggle caption iStockphoto