A woman in Port-au-Prince, Haiti, hangs her laundry to dry in front of her home. Her family made the shelter out of tin and tarps on land where their home stood before a massive earthquake devastated the nation in 2010. An estimated 80,000 Haitians displaced by the quake remain in tents. Joe Raedle/Getty Images hide caption

The city of Des Moines, Iowa, sits on the Raccoon and Des Moines rivers. The city's water works says it will sue three neighboring counties for high nitrate levels in these waterways. iStockphoto hide caption

Ignaz Semmelweis washing his hands in chlorinated lime water before operating. Bettmann/Corbis hide caption

An artist's rendering of what Dearcmhara shawcrossi probably looked like in dinosaur times. Todd Marshall/University of Edinburgh hide caption

Tina Fey, Margaret Cho and Amy Poehler talk onstage during the 72nd Annual Golden Globe Awards. Fey and Poehler hosted the awards for the third (and, they say, final) time. Handout/Getty Images hide caption

The U.S. Supreme Court hears arguments Monday in a case that looks at how municipal governments may regulate where and when signs are posted. Rick Bowmer/AP hide caption