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Courtesy Jessica Tierney ·

Left: Site map and schematic of geographic expansion of Homo sapiens from 200 thousand years ago to 50 thousand years ago. 

Right: Paleoclimate data from the Gulf of Aden (core RC09-166). A:Stable hydrogen isotopic composition of leaf waxes. B: Alkenone (UK′ 37)–based sea-surface temperatures.

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