As a 12-year-old, that's where I learned about party purges, and about Khrushchev for that matter.
Party purges are one topic that I am completely clueless about. 
mnli hypothesis: Party purges are one topic that I am completely clueless about.  premise: As a 12-year-old, that's where I learned about party purges, and about Khrushchev for that matter.