Professor Mark Maslin is Head of the Department of Geography at University College London
Why do we have such big brains? Paleoclimatologist Mark Maslin delves way back in history to see how natural past climate changes in Africa - from very dry to very wet - may have caused our distant ancestors to evolve a huge brain to deal with the new challenges ahead. He explores how this great evolutionary leap 2 million years ago provided the basis of smart modern day humans.
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