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How was human evolution and migration influenced by past changes in climate? Researchers聽at Aberystwyth University聽believe聽the answers lie beneath our feet - not here in Wales, though, but out in East Africa. Members of the department of Geography and Earth Sciences have been involved in an international project聽 drilling deep down in the mudflats of ancient lake beds in Africa. And it鈥檚 amazing what information can be gleaned from the sediment they鈥檝e removed. Adam learns more about some of the techniques involved and what the research might reveal about our origins.