Bipedalism—walking on two feet, is one of the defining characteristics of being humans, and scientists have debated for years how it came about. In the latest attempt to find an explanation, researchers trained five chimps(黑猩猩)to walk on a treadmill(跑步机)while wearing masks that allowed...
根据第一段“Why did humans evolve to walk upright?(为什么人类进化成直立行走?)”以及划线词后文“walking on two feet — is one of the defining characteristics of being human, and scientists have debated for years how it came about”可知,用两只脚走路——是人类的决定性特征之一,科学家们多年来...
chimps were measured both while walking upright and while moving on their legs and knuckles.That measurement of the energy needed to move round was compared with similar tests on humans and the results are published in this week's online edition of Proceedings of the National Academy of Sciences...
Why did humans evolve to walk upright? Perhaps because it’s just plain easier. Make that “energetically less costly”, scientifically speaking. Bipedalism—walking on two feet, is one of the defining characteristics of being humans, and scientists have debated for years how it came about. In...
Why did humans evolve to walk upright? Perhaps because it's just plain easier. Make that "energetically less costly," in science-speak.Bipedalism— walking on two feet — is one of the defining characteristics of being human, and scientists have debated for years how it came about. In the...
Prior to the chimp-treadmill study, which was the first study examining upright walking in adult chimpanzees, scientists debated a variety of explanations for why humans walk upright. Many of these explanations invoked the idea of energy conservation in one way or another. One theory proposed that...
If our ancestors lived somewhere really hot, the theory goes, it would have made sense for us to lose body hair, start sweating more, become slender(修长的) and even walk upright-to create distance between our bodies and the hot ground. ...
walk, when other animals walk much sooner, is because our brains don’t develop in the same way as other mammals. Our brains are much more complex, and we are learning to much from a very early age, so the skills required for humans to walk are simply not as easy or quick to ...
Why did we evolve to be so different? This question becomes even more acute when we compare ourselves with our closest relatives among the world's mammal species, the great apes (as distinguished from the gibbons or little apes). Closest of all are Africa's chimpanzee and bonobo, from ...
But if hair can lead to harm, why did we keep it on our heads? As bipeds, or animals that walk upright on two legs, our heads are directly exposed to the sun. Near the equator, where humans evolved, sun exposure can be overbearing, and head hair helps people avoid overheating. "It...