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With chimpanzee Ham standing next to him, a NASA technician goes over equipment in preparation for launch. Ham looks curious and trusting.

Why We Fight for Nonhuman Rights: Ham’s Story

A depressed male chimpanzee lays his head on his arm. In "How Animals Grieve," Barbara J. King writes about how chimpanzees and other nonhuman animals' emotional and social lives.

Travis, Tragedy and the Other Chimpanzees

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