I like this answer better. It also fits with my experience, mostly in the absence of training I could have received in my college days but did not because I was studying something else, but which would be very applicable to what I do now. It's hard to know where you'll end up.

Also, it's hard to know when people will need background information necessary to understand what someone is saying. I'm often blown away by what others do not know, only to turn around and find myself completely at a loss about something else.