Click on the Google Doodle (sorry not hyperlinked) to find out more about Mary Leakey.
She discovered some of the oldest human skulls (in the Olduvai Gorge, Tanzania) and nearby the 3.5 million year old footprints of human ancestors at Laetoli.
Do you remember the story? Two sets of adult footprints, female walking in the footprints of the male, with child sized footprints alongside as if they were holding hands.
All preserved in wet volcanic ash.
For more information:
http://www.pbs.org/wgbh/aso/tryit/evolution/footprints.html
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