Prosecutors in St. Louis County, Missouri, are investigating a Twitter post claiming the grand jury hearing evidence in the Ferguson shooting hasn't heard enough to warrant charging the police officer who shot and killed unarmed teenager Michael Brown.
Jimmy Carter's presidency swirled with turmoil, but his post-White House work promoting human rights, democracy and peace has earned him high praise. Carter turned 90 Wednesday. Here are a few facts to help reflect on the long life of America's 39th president:
Arctic ice is dwindling, the waters of the North Pacific Ocean are the warmest on record and tens of thousands of walruses have taken notice, "hauling out" on an Alaskan beach in numbers never seen before.