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A close-up of a "smiling" Yangtze finless porpoise at the Baiji Dolphinarium of the Institute of Hydrobiology, Chinese Academy of Sciences. Endemic to China’s Yangtze River, the Yangtze finless ...

Source: The Joseph H. Hirshhorn Museum / Public Domain Let’s start with an image. You are in a restaurant, at a bar, or driving to a beach with some friends. Someone says something funny, and everyone ...