Some 10,000 years ago, when glaciers chilled northern Europe, the Sahara desert was a fertile, well-watered land. Among the most favored parts of it must have been the Tassili-N-Ajjer, a plateau about ...
Today, the Sahara is a 3.6-million-square-mile expanse of blistering sand, sweeping dunes, and barren rock. It defines the very concept of an inhospitable wasteland. Yet, hidden deep within the arid ...
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