The risk-taking, emotive, exploratory, parent-rejecting tendencies of adolescents are seen in many social species, not just human. Unless it's the mother and father of all wild coincidences, this shows that teen brains are *meant* to do what they do.
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Why? Well, if you're a species who likes familiarity and safety, you're at risk of stagnation. But if certain members of your population, particularly ones in their physical prime, tend to reject the norms and wander off to try new things, that'll stave off stagnation
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