By Irene Klotz CAPE CANAVERAL, Fla. (Reuters) - Federal investigators cited inadequate training of test pilots by a Northrup Grumman Corp subsidiary on Tuesday as a leading factor behind last year's fatal crash of an experimental Virgin Galactic passenger spaceship over the Mojave Desert. The premature unlocking of the hinged tail section on Virgin Galactic's SpaceShipTwo triggered a midair breakup of the ship during its fourth powered test flight on Oct. 31, the National Transportation Safety Board said. Blame for the accident falls to Scaled Composites, the Northrop Grumman unit that developed the craft and employed its test crew, the NTSB said.
By Will Dunham WASHINGTON (Reuters) - If you want to know the secret behind the success of Tyrannosaurus rex and its meat-eating dinosaur cousins, look no further than their teeth. Scientists on Tuesday unveiled a comprehensive analysis of the teeth of the group of carnivorous dinosaurs called theropods, detailing a unique serrated structure that let them chomp efficiently through the flesh and bones of large prey. Theropods included the largest land predators in Earth's history.
Polar bears are known to be excellent swimmers, but new research suggests that they are also superb divers. Scientists recently observed a polar bear dive that lasted 3 minutes, 10 seconds, shattering the previous known record by about 2 minutes. The researchers ? Ian Stirling from the University of Alberta in Canada, and Rinie van Meurs, a naturalist and polar expedition leader from the Netherlands ? were studying polar bears in the Norwegian archipelago of Svalbard (located between continental Norway and the North Pole, east of Greenland), when they witnessed this epic underwater swim.