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[Edit] Obviously I'm ignorant. Excuse me.

• berntb 16y ago
  Obviously you neither know every area, nor have you thought about every type of problem. I haven't done that either. Or anyone else. The important thing is to love learning. If you haven't thought at least a bit about a problem area, you don't know enough to realize that you don't understand it. That has happened to me many times. I'm sorry if I was rough in the last comment.