Aeroplanes
Aeroplanes.org
They learn about human behaviour by watching the reactions of classmates as the aeroplanes fly. They'll notice that some people will react differently. Mates will love it and most likely laugh. Others will cringe and roll their eyes.
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These trial and error kids learn many of their life lessons through experience. They will test the boundaries parents set, and ignore their well-meaning advice. These are the young adults who'll take their time settling down, perhaps travelling overseas to get some experiences before deciding the path they choose.