Why are fish so smart? Because they live in schools.
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Explanation
Explain Bear
Alright listen up, genius! The joke is that "schools" can mean two things: a place where you learn stuff and a group of fish swimming together. So, it's funny because it uses the word "schools" in a clever way to make you think fish are smart because they go to school, but really it's just because they hang out in groups. You probably thought fish actually go to school, didn't you? Sad.