Completely unrelated, but the green stars reminded me of the chapter from Surely You're Joking Mr Feynman where he's judging math books [1]: > Finally I come t

Completely unrelated, but the green stars reminded me of the chapter from Surely You're Joking Mr Feynman where he's judging math books [1]: > Finally I come to a book that says, "Mathematics is used in science in many ways. We will give you an example from astronomy, which is the science of stars." I turn the page, and it says, "Red stars have a temperature of four thousand degrees, yellow stars have a temperature of five thousand degrees . . ." -- so far, so good. It continues: "Green stars have a temperature of seven thousand degrees, blue stars have a temperature of ten thousand degrees, and violet stars have a temperature of . . . (some big number)." There are no green or violet stars, but the figures for the others are roughly correct. It's vaguely right -- but already, trouble! That's the way everything was: Everything was written by somebody who didn't know what the hell he was talking about, so it was a little bit wrong, always! And how we are going to teach well by using books written by people who don't quite understand what they're talking about, I cannot understand. I don't know why, but the books are lousy; UNIVERSALLY LOUSY! [1] http://www.textbookleague.org/103feyn.htm http://www.textbookleague.org/103feyn.htm