Chimpanzees split from the human branch of evolution about four to six million years ago; they are our closest relatives in the animal world. They use tools like spears, they have limited language capability, and they are sophisticated group hunters. They can be deceptive in their behavior, and they are capable of planning for future events. They can mourn, and they can be altruistic within their groups. Our human sense of being fundamentally different from all other animals needs to be reexamined; it is probably the deepest hypocrisy we carry.

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