Depending on your definition of modern, History of the World Part 1 is great.

Mine is ButWhyFi

First thought it sounded like a scam because people were talking about it the same way people talked about crypto. Looked into it enough after the reddit api shenanigans that I wanted to make a lemmy account and I’m still learning new things about it.

Wish we could make slice catch on. Not only for the reason you mentioned, but it also implies that what you are looking at is a part of a whole. So communities are a slice of lemmy.