I home school my two teens.
Every couple of weeks I give them a conspiracy theory to look up, write a bit about, and give me their opinion on, and reasons for that opinion. It helps them with research and critical thinking (I hope).
I've done a lot of the obvious ones, New world order, 9/11, JFK assassination, some of the denial ones in WW2 etc.
I'm running out of ideas for other ones, preferably that incorporate history, geography etc, or just ones that are a bit out there or interesting.
TIA 