The spread of humans around the world from Africa thousands of years ago wiped out big mammals in a shrinking trend that could make the cow the biggest mammal on Earth in a few centuries` time, a scientific study said on Thursday.Apr 20, 2018, 11:16 AM IST
Scientists have discovered a new species of tyrannosaur dinosaur. They also found that their face was covered in a scaly protective layer with a high degree of tactile sensitivity, similar to crocodiles.Apr 01, 2017, 22:19 PM IST
One myth dispelled by the results is that in earlier eras people went to bed at sundown. The subjects of the study stayed awake an average of three hours and 20 minutes after sunset.