LifeDinosaurs evolved feathers to scare prey, suggests robot experiment Experiments with a robotic dinosaur suggest feathers may have evolved to startle prey into fleeing from hiding places, a strategy used by some modern birds 51¶¯Âþ
EarthSun-blocking dust from asteroid impact drove the dinosaur extinction The Chicxulub impact 66 million years ago filled the sky with fine silicate dust, which blocked out sunlight and lingered for 15 years 51¶¯Âþ