Archaeologists find 300,000-year-old stone tools in Saudi Arabia, which at the time was a grassland dotted with lakes. Findings will help anthropologists better understand the role of environment—and the ability to adapt to challenging new landscapes—in shaping human evolution and global expansion.

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Archaeologists find 300,000-year-old stone tools in Saudi Arabia, which at the time was a grassland dotted with lakes. Findings will help anthropologists better understand the role of environment—and the ability to adapt to challenging new landscapes—in shaping human evolution and global expansion.