Warum afrikanische Frauen fast mühelos schwere Lasten auf dem Kopf tragen

"Unlike the rest of us, the African women were supporting the load with the structural components of the body, rather than metabolizing tissues of the body. They were balancing it perfectly on their bones, without the aid of any muscle, tendon, or supporting structures. Over time, Heglund showed, the bones and bodies of the African women had adjusted to perfectly support the head weight in the most energy efficient manner. The structure had adjusted so it aligned in an ideal formation to keep the weight off the muscles."
http://nautil.us/blog/new-exoskeletons-will-harness-the-subtle-anatomy-of-human-balance