Ukrainian President Petro Poroshenko addressed a joint meeting of Congress Thursday, thanking lawmakers for their support of Kiev in its fight against Russian-backed separatists.
Iran's foreign minister says the U.S. has been hesitant and contradictory in its approach to combating extremist groups in Iraq and Syria.
Remember the giant hole in the Earth's ozone layer? Scientists say it's shrinking a little, thanks in part to the elimination of CFCs.
President Obama is set to meet congressional leaders this afternoon to outline his strategy for confronting the Islamic State insurgency in Iraq and Syria. He is scheduled to address the nation on Wednesday to make that strategy public.
U.S. public support for airstrikes in Iraq and Syria has spiked as President Obama prepares to meet with leaders in Congress.
Decades after the threat of extinction led to them being protected from whalers, there are now about 2,200 blue whales off the West Coast, according to a new study.
Passenger pigeons were once the world's most abundant birds. Massive flocks of more than 1 million would darken the sky.
Beijing has rejected U.S. claims that one of its fighter jets acted recklessly in intercepting a U.S. Navy maritime patrol plane in the South China Sea last week, warning Washington to curtail or discontinue "close surveillance" flights near Chinese territory.
Ukrainian President Petro Poroshenko says Russian troops entered his country on Thursday.
SeaWorld has decided not to appeal a court ruling that prohibits its trainers from performing with killer whales, the Orlando Sentinel reports, citing a filing with the Securities and Exchange Commission.