Most of the close interpersonal relationships that are damaged by misunderstanding the other people's point of view or not accepting when an mistake has done. On 2015 JT Lewis' article "Apologies in Close Relationships: A Review of Theory and Research", a review of eight studies examining predictors of the occurrence and effectiveness of apologies was performed. The results associated positive relationship outcomes when the transgressor apologized, particularly when the apology was related with adopting a self-focus or self-other focus.
Wind, water, tide and muscle - both animal and human - provided sources of energy that are still available to man and are still used to power simple machines in many parts of the world today.
I don't have the book so I can't give a line of evidence but Atticus was all about teaching Jem and Scout those little life lessons without them even noticing so this instance was one of those little lessons he gives them. Hope this helps :)
