Scientists may have discovered the fossilized skull of a 'Siberian unicorn'

Heinrich Harder/Wikimedia For decades, scientists have estimated that the Siberian unicorn — a long-extinct species of mammal that looked more like a rhino than a horse — died out some 350,000 years ago, but a beautifully preserved skull found in Kazakhstan has completely overturned that assumption. Turns out, these incredible creatures were still around as recently as 29,000 years ago.   Before we talk about the latest discovery, yes, there was a very real 'unicorn' that roamed Earth ten...