The first human footprint discovered at the Alathar ancient lake. Humans may have hunted the big mammals but they did not stay long, using the watering hole as a waypoint on a longer journey. This detailed scene was reconstructed by researchers in a new study published in Science Advances on September 16, following the discovery of ancient human and animal footprints in the Nafud Desert that shed new light on the routes our ancient ancestors took as they spread out of Africa. Klint Janulis / AFP

Saudi Arabia discovers new archaeological site that dates back 120,000 years