People attend a candlelight vigil in front of the WDBJ-TV station in Roanoke, Va. a day after reporter Alison Parker and cameraman Adam Ward from the station were killed during a live broadcast. Don Petersen/AP hide caption

itoggle caption Don Petersen/AP

Serena Williams en route to winning the Western & Southern Open in Cincinnati on Sunday. Tannen Maury/EPA/Landov hide caption

itoggle caption Tannen Maury/EPA/Landov

Medical volunteers walk past tents set up on the playground of a primary school as temporary shelters for victims after explosions in Tianjin, China, on Aug. 13. Reuters/Landov hide caption

itoggle caption Reuters/Landov

Former President Jimmy Carter discusses his cancer diagnosis during a press conference at the Carter Center on Thursday in Atlanta, Georgia. Jessica McGowan/Getty Images hide caption

itoggle caption Jessica McGowan/Getty Images