乔治华盛顿大学的人类学家艾琳·玛丽·威廉姆斯，试图找出进化是如何发生的，制造工具是怎么帮助塑造我们的手和手腕的。
At George Washington University, anthropologist Erin Marie Williams is trying to find out how that evolution took place. How did tool-making help shape our hands and wrists?
科赫和密苏里州一位物理学家的女儿玛丽·罗宾森(Mary Robinson)结了婚，他们育有四子：弗莱迪、查理斯和一对双胞胎——戴维和威廉姆。
Koch married Mary Robinson, the daughter of a Missouri physician, and they had four sons: Freddie, Charles, and twins, David and William.
“给自己更多的空间表达自己真实的想法和感受，你才会有更多的空间来施展你的才智。”—玛丽安·威廉姆森。
"The more room you give yourself to express your true thoughts and feelings, the more room there is for your wisdom to emerge." - Marianne Williamson.
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