Portal was the first Valve-developed game to be added to the OS X-compatible list of games available on the launch of the Steam client for Mac on May 12, 2010, supporting Steam Play, in which players that had bought the game either on a Macintosh or Windows computer could also play it on the alternate system.
1 Eurasian Pleistocene megafauna became extinct in roughly same time period despite having a much longer time to adapt to hunting pressure by humans. 2  However, the extinction of the Eurasian megafauna can be viewed as a result of a different process than that of the American megafauna.
Scientists may have figured out why the woolly mammoth became extinct. A new study of the prehistoric beasts suggests they might have been wiped out after the last Ice Age. There's evidence that humans hunted mammoths and it was previously thought the mammoth may have driven to extinction by hunters. But scientists analysed the dozens of mammoth fossils and now think rising temperatures melting the mammoths' habitat drove them to extinction.