杏吧原创

Having cloned sheep and who knows what else, wouldn't it be a good idea for scientists to begin cloning the world's endangered species? Is there any reason not to?

Personal experience suggests that if you put human males beside a body of water with a supply of stones to hand, they will soon start throwing them into the water. What drives them to do this, and is the same true of human females? Is this unique to humans, or has it been observed in other primates? What purpose can it possibly serve?