CIA Instructor George Higgins checks the slices of pie made by students. Allison Aubrey/NPR hide caption

Most living kidney donors return to their daily lives in a matter of weeks, but for some, unforeseen physical and financial complications arise. iStockphoto.com hide caption

Hong Kong Chief Executive Leung Chun-ying and his wife, Regina, shake hands with supporters Sunday during a flag-raising ceremony to mark the 15th anniversary of Hong Kong's handover to China. Leung was sworn in as Hong Kong's third leader amid growing discontent with China's rule over the Asian financial center. Kin Cheung/AP hide caption

This image, from a sensor at the particle accelerator at CERN, is an example of the data signature a Higgs particle might generate. CERN hide caption

Angels — good and evil — abound in Solomon Jones' thriller, The Last Confession. The book begins with the discovery of a body beneath the famous angel statue in Philadelphia's 30th Street Station. Jeff Berman via Flickr hide caption