Sophie Abrahams of Oxford Sparks explained why walking backward with your hand ... Essentially, the natural frequency of a ...

An curved arrow pointing right. Human hands are capable of performing incredibly complex movements like no other parts of the body. But it's been a long-term mystery of how they evolved into their ...

Our ability to walk upright, freeing our hands for other purposes ... In 1973, when Don Johanson found a surprisingly human-looking fossil knee at Hadar in Ethiopia that tuned out to be more ...