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.
他们也许能在今年春天就成功克隆米茜——也可能再过5年也成功不了，看来，人类最好的朋友的繁殖机制是现代科学的一个难解之谜。
They just might succeed in cloning Missy later this year-or perhaps not for another five years. It seems the reproductive system of man's best friend is one of the mysteries of modern science.
他说，优良的农业科学可能会在人工繁殖中消除任何对人类有害的疾病。
He says good farming and science could probably wipe out any diseases that may be harmful to humans.
基于这种基因重组，科学家们估算出，人类与阿尔泰山脉尼安德特人的祖先在大约10万年前进行过混种繁殖——远在普遍认为的人类离开非洲的时间之前。
Based on this gene shuffling, the scientists estimated that humans and the ancestors of the Altai Neanderthals interbred about 100,000 years ago - long before people were thought to have left Africa.
基于这种基因重组，科学家们估算出，人类与阿尔泰山脉尼安德特人的祖先在大约10万年前进行过混种繁殖——远在普遍认为的人类离开非洲的时间之前。
Based on this gene shuffling, the scientists estimated that humans and the ancestors of the Altai Neanderthals interbred about 100,000 years ago - long before people were thought to have left Africa.
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