Science: The Secrets of Spirit Cave

Archaeologists long ago concluded that man first began to farm around 7500 B.C. in the Middle East's Fertile Crescent. Other excavations have shown that he also acquired agricultural skills at roughly the same time in what is now Mexico and Central America. More recent discoveries by members of a University of Hawaii expedition in northern Thailand may well push the birth of agriculture even farther back. The Thai evidence suggests that peoples of Southeast Asia tilled the soil more than 2,000 years before anyone began to farm in the Middle East or the...

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