A cool article about how exacting Fred Rogers was about the language used on his show so that it wouldn't confuse or accidentally mislead kids: https://www.theatlantic.com/family/archive/2018/06/mr-rogers-neighborhood-talking-to-kids/562352/?single_page=true
I especially love the examples given.
@lauraritchie That's so awesome! Wow. I was already pretty impressed with that guy, but the more I learn, the more impressed I am.