单词：palaeoanthropologist
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This is Scientific American's 60-Second Science, I'm Cynthia Graber. This'll just take a minute. If evolution weeds out detrimental traits, why do some seem to stick around? Well what's bad in our current environment may have been good in the conditi
Scientific American(六)月
KELLY MCEVERS, HOST: To cross from Mexico into the U.S. without legal permission can mean days of walking through rivers, deserts and mountains and through places where dangerous criminals prey on migrants. Jason de Leon thinks the paths that migrant
2017年NPR美国国家公共电台10月
American anthropologist explores diverse cultural landscape of Middle East Mohamed Elshinnawi | Washington, DC 09 June 2010 Enjoying a Yemeni meal with villagers in 1986 Despite decades of close U.S. involvement in Middle East affairs, most Americans
VOA标准英语2010年(六)月
By Mike O'Sullivan Los Angeles 18 January 2006 Scientists who study human development have always faced a dilemma. The need to procreate and protect our genetic offspring can be overridden in humans w
2006年VOA标准英语（一月）
You might not have as many close friends as you think. Researchers have provided new evidence that lends weight to a theory that says you can only maintain five close friendships. 你的亲密朋友也许没有你想的那么多。研究员提供的新
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A drop in testosterone levels around 50,000 years ago led the the development of art and tools, researchers believe. 有研究人员认为，5万年前人体睾丸素水平的降低促进了人类艺术和工具领域的发展。 They say the drop, w
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