The first strategic stealth bomber unveiled by the US Air Force in 30 years was on Friday. The B-21 Raider, which is expected to cost over $500 million, has not yet taken its first flight. In a ceremony at Air Force Plant 42 in Palmdale, California, the Northrop Grumman bomber, which can transport both conventional and nuclear missiles, was on display. Senior Pentagon officials, including Secretary... 

World famous physicist Stephen Hawking says humankind should colonize other planets to ensure the future of the species. He claimed armed aggression could end civilization and that space travel would provide somewhere to go. While taking an American visitor on tour of London’s Science Museum, the physicist said colonizing other planets could be “life insurance” for whatever embattled remnants...