Teens in particular get a lot of stick for this. Their rebelliousness, they're highly-emotional nature, it's seen as proof they have something 'wrong' with their brains, because they're immature
The opposite is true. Their brains are doing exactly what they evolved to do
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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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