Science Solves the Riddle of Why We Swing Our Arms While We Walk...
Takin' a break from weighty science research like finding a cure for cancer and whatnot, scientists have now solved the riddle of why we swing our arms when walking:Swinging one's arms comes at a cost. We need muscles to...
https://www.neatorama.com/2009/07/29/science-solves-the-riddle-of-why-we-swing-our-arms-while-we-walk/
