The World Wildlife Fund's (WWF) Earth Hour is an annual global event held on the last Saturday of March, in which participants turn off non-essential electrical appliances for an hour in order to raise awareness on climate change. This picture provided by Commonwealth Edison shows buildings in downtown Chicago darkened during Earth Hour 2009 on Saturday, March 28, 2009. The Wrigley Building is seen at center.
Washington, D.C., enacted new gun-control laws after the US Supreme Court in 2008 invalidated its previous gun ordinance. On Friday, a federal judge upheld the new rules, though the decision is expected to be appealed.
Five-year-old Lenny Popova, of Arlington, Va. inspects the teeth of a Tyrannosaurus rex at the National Zoo, in October 2000. The Tyrannosaurus, meaning 'tyrant lizard' lived in Western North America during the last part of the Cretaceous Period, about 68 to 65 million years ago.
Albert Gonzalez cost companies and insurers almost $200 million, federal prosecutors say, earning him the longest sentence ever leveled for cyber crime.
Health care supporters in Congress clearly defied the will of voters. Will we hold them accountable?
Web networking among the unemployed is surging, but experts stress that human contact matters as much as online friends.
A beetle climbs on rain-spotted clover leaf at River Forks Park in south western Oregon.
Popping up in military bases, airports, fast-food restaurants, and hospitals is a new kind of vending machine that offers everything from a DVD rental to a digital camera.
Michigan had asked the Supreme Court to order Chicago to close two locks to stop the invasive Asian carp from getting to the Great Lakes.