By Melissa Hogenboom, Science reporter, BBC News
Scientists have discovered that about one in thirteen people have flexible ape-like feet.
A team studied the feet of 398 visitors to the Boston Museum of Science.
The results show differences in foot bone structure similar to those seen in fossils of a member of the human lineage from two million years ago.
It is hoped the research, published in the American Journal of Physical Anthropology, will establish how that creature moved.
Apes like the chimpanzee spend a lot of their time in trees, so their flexible feet are essential to grip branches and allow them to move around quickly - but how most of us ended up with more rigid feet remains unclear.
Jeremy DeSilva from Boston University and a colleague asked the museum visitors to walk barefoot and observed how they walked by using a mechanised carpet that was able to analyse several components of the foot.
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