Hanle says the focus is on offering special programs for teachers at middle schools and high schools because that's when the students start to lose interest in studying science.

VOA: standard.2009.11.25

I lose my interest in philosophy and take up an interest in, I don't know,something that completely doesn't-- organic chemistry holds no interest to me whatsoever.

我失去了对哲学的兴趣，对一个完全不相干的东西-,比如以前完全不感兴趣的有机化学。

耶鲁公开课 - 死亡课程节选