[madhadron]

I followed the first two thirds of this, and stopped because I felt that I wasn't getting much. A lot of names for things I already knew, but nary a theorem or meaty result that gave me any new insight. I think my greatest benefit was no longer feeling like MacLane's book needs to be on my reading list.

Also, I discovered that there are cranks even in category theory! There was this guy Robert Rosen who tried to apply it to biology, got totally confused, wrote three giant books, and now has a posthumous following. That wasn't something the lecturers were pushing, but it came up among the students.