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.
There is a theory that the extinction of Neanderthal man was hastened by the Campanian Ignimbrite Eruption, a violent eruption in the Phlegraean Fields near Naples in Italy about 39,280 Â± 110 years (older estimate ~37,000 years) ago, erupting about 200 km3 (48 cu mi) of magma (500 km3 (120 cu mi) bulk volume)