Today the Sahara Desert is a dry nearly lifeless expanse of sand and rock. But its geologic history is complex with periods of desert lands alternating with wetlands containing vast lakes and river systems. The cycle, controlled in large part by the Earth’s tilt on its axis, even led to the rise of the Egyptian civilization in the Nile River Valley. The past home to pre-historic dinosaurs and more modern whales, research points to a future when the Sahara will be wet again.  Join us to find out when and why.