The lead author of the research says he does not know if the shoe was made for a man or a woman.

VOA: special.2010.08.03

They have not evolved to tolerate some of the man made sounds that have very unusual and unnatural physical characteristics. These sounds are for example explosives, industrial noise, musical instruments, power tools, and headphones.

还没有进化到能忍受,某些怪异，超出常规的人为声响,如爆炸，工业噪音,乐器，电动工具和耳机等等。

斯坦福公开课 - 7个颠覆你思想的演讲课程节选

Man is not made for servitude."

人不会天生就是奴隶"

耶鲁公开课 - 美国内战与重建课程节选