President Obama marked World AIDS Day Thursday by announcing plans to boost U.S. efforts to fight AIDS at home and abroad. Evan Vucci/AP hide caption

itoggle caption Evan Vucci/AP

President Obama received a warm welcome at Scranton High School in Scranton, Pa., Wednesday. A surge in Hispanic voters in that state could make his chances of winning it a little more likely. Carolyn Kaster/AP hide caption

itoggle caption Carolyn Kaster/AP

Demonstrators in London marched outside the Houses of Parliament on Wednesday to protest against pension cuts. The issue has stirred demonstrations in many parts of Europe and the U.S. Adrian Dennis/AFP/Getty Images hide caption

itoggle caption Adrian Dennis/AFP/Getty Images

Do you really need that MRI, or is your doctor just trying to make a buck? iStockphoto.com hide caption

itoggle caption iStockphoto.com

A placard of a child sits on a table during a conference Oct. 31 on human sex trafficking in Atlanta. The Georgia Department of Education estimates that about 5,000 girls in the state are at risk for trafficking each year. David Goldman/AP hide caption

itoggle caption David Goldman/AP

Sen. Sherrod Brown, D-Ohio, speaks on Capitol Hill about the Hire Heroes Act, which gives tax breaks to businesses that hire unemployed veterans. Vets that have served since 2001 face a higher unemployment rate than the population overall. Brendan Smialowski/Getty Images hide caption

itoggle caption Brendan Smialowski/Getty Images

New York Police Department Commissioner Raymond Kelly (left) addresses questions as U.S. Attorney Preet Bharara listens during a news conference announcing the arrest of five police officers in October. Spencer Platt/Getty Images hide caption

itoggle caption Spencer Platt/Getty Images