You can learn technological things, you can learn about specific things, but the real problems that people deal with in any subject, existential subjects or romantic subjects, you never learn anything. So you make a fool of yourself when you're 20, you make a fool of yourself at 40, at 60 at 80. The ancient Greeks were dealing with these problems. They screwed up all the time. People do now.
Woody AllenStandard mathematics has recently been rendered obsolete by the discovery that for years we have been writing the numeral five backward. This has led to reevaluation of counting as a method of getting from one to ten. Students are taught advanced concepts of Boolean algebra, and formerly unsolvable equations are dealt with by threats of reprisals.
Woody Allen