“[N]obody ever made a million dollars on {{w|educational television}}.Five years after the series went public, we got a letter ...saying, "You’ve crossed the threshold. You now share in the revenues." ...But by then, there were no more revenues. ...I didn’t care ...That wasn’t the purpose ...Later on, we applied to the {{w|National Science Foundation}} for an additional $3 million to turn out a high school version ...without calculus.”