一位认知科学家，大卫基尔，其报告指出，由于人类社会的进步越来越复杂，个人并不需要有那些为了生存和繁殖的智力。
One cognitive scientist, David Geary, argues that as human society grows increasingly complex, individuals don't need to be as intelligent in order to survive and reproduce.
科学家本周五说，由于人类的过度捕杀，海洋中食肉性的大型鱼类越来越少，在过去一百年里只剩下小型鱼成倍繁殖。
Fewer big, predatory fish are swimming in the world's oceans because of overfishing by humans, leaving smaller fish to thrive and double in force over the past 100 years, scientists said Friday.
科学家得出结论，人类一定是在离开非洲大陆后和尼安德特人进行了混种繁殖。
They concluded that humans must have interbred with Neanderthals after leaving Africa.
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