Kurdish peshmerga fighters keep watch during the battle with Islamic State militants on the outskirts of Mosul on Jan. 21. Azad Lashkari/Reuters/Landov hide caption

Martin Luther King Jr., with his wife, Coretta, at a Harlem hospital after he was stabbed by Izola Ware Curry in 1958. AP hide caption

Known by the nickname "Wall Street," Curtis Carroll teaches financial literacy at the San Quentin Prison, helping inmates prepare for life after incarceration. Carroll, however, is serving a life sentence. Courtesy of The California Department of Corrections and Rehabilitation hide caption

Randy Olson's algorithm devised the optimal driving route to 50 tourist spots in the Lower 48 states. Randy Olson hide caption

A statue of the scales of justice stands above the Old Bailey, the courthouse where many high-profile libel cases are tried, in London. The U.K. is a popular place for libel cases to be filed because of laws that make it difficult for journalists or the media to prevail. Dan Kitwood/Getty Images hide caption

Shamir's dance music has gospel, country, and disco influences, but it's his androgynous voice that surprises most people. Ruvan/Courtesy of the artist hide caption

A 12-year-old on trial in the stabbing death of a 9-year-old talks to his lawyer in 2014 in a Michigan circuit court. The Justice Department is targeting a Georgia case in the hopes of making legal representation for juveniles there more effective, but they say the problems occur nationwide. Chris Clark/Landov hide caption

Julio Cesar Chavez at his home in Tijuana, Mexico. Carrie Kahn/NPR hide caption

This week Kraft Foods recalled nearly 2.5 million boxes of macaroni and cheese that were potentially contaminated with metal pieces. Kraft and other processed food manufacturers are facing many challenges. Toby Talbot/AP hide caption

N. gardneri mushrooms grow at the base of young babassu palms in Brazil. A bland tan by day, the fungi emit an eerie green light by night. Michele P. Verderane/IP-USP hide caption

James Corden takes over as host of The Late Late Show next Monday. Art Streiber/CBS hide caption

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Soprano Catalina Cuervo, singing the role of Frida Kahlo, rehearses with bass baritone Ricardo Herrera, singing the role of Diego Rivera, on Feb. 21, 2015 at the Michigan Opera Theatre in Detroit. Veronica Zaragovia/KUT hide caption