The Smithsonian's Jon Blundell scans the fossilized foot bone — the metatarsal — of the Wankel T. rex to help create a digital 3-D image of the long-dead dinosaur. Nikki Kahn/The Washington Post hide caption

itoggle caption Nikki Kahn/The Washington Post

Participants in an ethical hacking contest at a Swiss security conference in Geneva in March. So-called bug bounty programs are becoming very popular in Silicon Valley's high-tech sector. Salvatore Di Nolfi/EPA/Landov hide caption

itoggle caption Salvatore Di Nolfi/EPA/Landov

China's WeChat messaging app has a huge audience that allows Chinese to organize online. Petar Kujundzic/Reuters/Landov hide caption

itoggle caption Petar Kujundzic/Reuters/Landov

Benedict Cumberbatch, right, and Martin Freeman star as Sherlock Holmes and John Watson on the BBC's crime drama Sherlock. Robert Viglasky/© Hartswood Films hide caption

itoggle caption Robert Viglasky/© Hartswood Films

Tom Magliozzi's laugh boomed in NPR listeners' ears every week as he and his brother, Ray, bantered on Car Talk. Courtesy of Car Talk hide caption

itoggle caption Courtesy of Car Talk

Laney Barroll Stark, of Savannah, Ga., took a picture with her cell phone as Rep. Jack Kingston, who ran for the Republican nomination for U.S. Senate in Georgia, addressed supporters at his primary runoff election night party in July. David Goldman/AP hide caption

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Strontium atoms floating in the center of this photo are the heart of the world's most precise clock. The clock is so exact that it can detect tiny shifts in the flow of time itself. Courtesy of the Ye group and Brad Baxley/JILA hide caption

itoggle caption Courtesy of the Ye group and Brad Baxley/JILA

Although Apple CEO Tim Cook's sexual orientation wasn't public, it has been something of an open secret in business and technology circles. Michael Graae/Getty Images hide caption

itoggle caption Michael Graae/Getty Images