A still from the video for Rihanna's "Rude Boy," co-written by Makeba Riddick. via YouTube hide caption

Frank Wallace, who is unemployed, displays a sign during a vigil in Philadelphia. The Philadelphia Unemployment Project and other organizations gathered to draw attention to federal unemployment benefits that are scheduled to expire. Matt Rourke/AP hide caption

Eggs of the parasite called the human whipworm, responsible for Trichuriasis, a disease that affects the large intestine and causes gastrointestinal problems. Drug companies are now trying to create parasites for treating inflammatory bowel disease. Public Health Image Library/CDC hide caption

Simon Green, who performs as Bonobo, is preparing for his European tour. His latest album, Black Sands, was released last year. Will Cooper-Mitchell hide caption