A pro-gay-marriage protester stands in front of the Supreme Court on Tuesday, the first of two days of oral arguments on challenges to laws that limit the definition of marriage to unions of a man and a woman.
Karen Bleier/AFP/Getty Images
The Solar Impulse, a solar-powered plane, flies over Switzerland. The makers will be journeying across the U.S. this spring, hoping the flight helps challenge assumptions about what solar technology can do.
Courtesy of Solar Impulse
This photo illustration released by Adidas shows the uniforms for NCAA basketball teams (from left) University of Cincinnati, University of Kansas, University of Notre Dame, Baylor University, UCLA and the University of Louisville.