Stone Age humans or their relatives occasionally trekked through a green Arabia
Long-ago rains drew hominids in phases to what’s now dry desert
Excavations at the Jubbah oasis (shown) in northern Saudi Arabia produced stone tools that, along with nearby lake bed finds, indicate that hominids periodically trekked through the region starting around 400,000 years ago.
Ceri Shipton/Palaeodeserts Project