[Yawrehto]

Puzzles - not necessarily jigsaw, but more logic-puzzle types.

Building something.

And I tend to have intense focus if it's 'compiling exhaustive and thorough analyses debunking someone's point in a minor statement they made a week ago that they weren't even thinking about', but that might be me. (One time I spent probably hours carefully trying to figure out the likelihood that an immigrant comes from a country with higher vaccination rates than the US - something around 1/3 if I recall correctly - and then remembered that the US requires vaccinations for all legal immigrants and as undocumented immigrants aren't the majority of immigrants - yes, I did research on that - if you worry about unvaccinated people, you have more to worry about from native-born Americans than immigrants. I did this in response to a passing comment somewhere about how immigrants were bringing disease or something.)

In a similar vein as the previous one, researching a subject you find fun. I remember being like twelve and writing a 20-page paper on Jewish mobsters and the Jewish community and if I recall correctly the 'upper upper' limit was 12. Again: possibly (definitely) just me.