新研究证明远古人类直立时已有作战能力

New research into why early humans stood up millions of years ago suggests it may have improved their ability to punch each other. Here's Jon Stewart from our science team.

The move from four legs to two was a key moment in human evolution, and what drove that change has long been debated. Theories range from allowing us to pick food from trees to carry tools or to be able to run faster. Now Professor David Carrier from the University of Utah in the US has found that it improves fighting ability. Professor Carrier's report also provides an explanation for why women tend to find taller men more attractive. Being better at fighting might have provided an evolutionary advantage, meaning that tall men would have children with the best chance of surviving and passing on genes.

BBC News

过去几个月，中东地区发生了声势浩大的抗议活动。之后，奥巴马总统概述了美国对中东政策。他说到了揭竿而起，通过非暴力方式带来变革的人们。华盛顿，Paul Adams报道。

这理所当然的是涉及范围非常广泛的讲话，是总统总结过去六个月阿拉伯世界的动乱的教训的机会，是表明美国的反应的机会。

“我们有机会表明，美国重视突尼斯街头抗议者的利益超过独裁者的权利。毫无疑问，美利坚合众国对促进自主和机会的变革表示欢迎。”