Al-Ahsa oasis is a rare green patch in Saudi Arabia today Michael Runkel/Robert Harding/Alamy
Today Arabia is a scorching desert, but it has been green and lush several times in the past 8 million years. That means animals from Africa could have wandered into the area 鈥 potentially including early human relatives that were thought to have been confined to Africa.
鈥淭he deserts are turning on and off through time,鈥 says at Griffith University in Brisbane, Australia. 鈥淲e have hippos coming out of Africa. Why not hominins?鈥
