John Ryan, CEO of the National Center for Missing and Exploited Children, speaks during a press conference about a child sex trafficking operation on Monday in Washington. Brendan Smialows/AFP/Getty Images hide caption

A nematode worm glows as it nears death in this screenshot from a YouTube video showing the work of researchers in London. Wellcome Trust/YouTube hide caption

Yasiel Puig of the Los Angeles Dodgers breaks his bat on a single to right field during a game in June. The rate of such breaks has been cut in half since 2008. Victor Decolongon/Getty Images hide caption

Sartorial Anarchy #5, 2012. Ike Ude, photographer. In his Sartorial Anarchy self-portraits, New York-based Nigerian-born artist Ike Ude creates composite images of the dandy across geography and chronology. Ude photographs himself in disparate ensembles, pairing, for example, a copy of an 18th-century Macaroni wig with other carefully selected vintage garments and reproductions. Courtesy of Leila Heller Gallery Ike Ude hide caption

Robert Klein International Film Circuit hide caption

Thai Elephant Orchestra co-founder David Sulzer (bottom center, in red) poses with the animals and their mahouts, or keepers. Jerry Alexander/Courtesy of the artist hide caption