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Sheldon Cooper is a physicist. He is clever. But he is mean (刻薄的) and often makes people angry. He is one of the main characters (主角) on the popular TV show The Big Bang Theory (《生活大爆炸》). What was he like as a kid? The show Young Sheldon (《小谢尔顿》) can tell you. Meet Sheldon and his family below.