Regent's Park Mosque, also known as London Central Mosque, where Umar Farouk Abdulmutallab worshiped while he was living in London from 2005 to 2008. An ex-member of a radical Islamist group says gatherings at the mosque, and others like it, are used to identify potential recruits. Courtesy of Pucasso via Flickr hide caption

These mutant nematode worm embryos are genetically identical, but fluorescence imaging shows they are not exactly the same. The pink spots are mRNA molecules involved in gut development. Some twins have spots and some don't, which means some will develop guts and others won't. Arjun Raj hide caption

Efficiency experts try to make factories like this run more smoothly. Andreas Rentz/Getty Images hide caption

Stacks of rocks built by passersby near the Olympic Village in Vancouver. The piles are reminiscent of the inukshuk, a kind of stone cairn found in the Arctic that has been adopted as the official symbol of the 2010 Winter Olympics. Martin Kaste/NPR hide caption

Tod Browning's 1931 film Dracula, released in the chaos and uncertainty of the Great Depression, turns in part on the character of Mina (Helen Chandler), who manages to maintain her i--ocence — and--ontrol — despite having suffered at the hands of Bela Lugosi's vampire. Hulton Archive/Getty Images hide caption