What are some of the most comforting facts about history?

I think this is a nice change of pace from the usual depressing questions about war and genocide and the like. It can be anything from the ancient era onwards, as long as it just puts a smile on your face.<br>【EDIT 2018-06-07 20:15:】 Holy shit this blew up. Guess there’s a lot more of you guys than I thought. Welcome!