Doctors work on a patient with two broken legs Tuesday, implanting bolts so they can attach stabilizing rods to each leg, in a field hospital in Port-au-Prince. The hospital was set up by emergency medical teams dispatched by the U.S. Department of Health and Human Services.
Haiti's President Rene Preval answers questions from the press as Secretary of State Hillary Clinton looks on in Port-au-Prince on Saturday. Preval and Clinton met to discuss the state of emergency after last week's deadly earthquake.
Researchers dyed sperm from each deer mouse a different color; in this case, red represents one male and green another. The sperm joined together with their own kind, as seen here, allowing them to swim faster than those that did not cluster together.