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Driven by Earth's orbit, climate changes in Africa may have aided human migration（图）
Driven by Earth's orbit climate changes Africa may aided human migration
2020/2/20
In 1961, John Kutzbach, then a recent college graduate, was stationed in France as an aviation weather forecaster for the U.S. Air Force. There, he found himself exploring the storied caves of Dordogn...
The radar system described here (CMOR) comprises a basic 5-element receiving system, co-located with a pulsed transmitter, specifically designed to observe meteor echoes and to determine their positio...