For Khan,teaching math,science, and finance is just the beginning.

VOA: standard.2010.03.26

But, you know, I know someone who was a teacher in a Chicago public school for decades and lost his job, teaching math to high school kids, because he is gay.

我认识一个任职于,一所芝加哥公立学校几十年的老教师,被解雇了，他在高中教数学，仅仅是因为他是同性恋。

普林斯顿公开课 - 人性课程节选

But some schools say a federal law that only measures progress in math and reading has hurt language teaching.

VOA: special.2010.02.04

We have a step-by-step procedure we follow." (VOICE) Gertie Walls started teaching Singapore Math to her students a couple of years ago.

VOA: standard.2010.08.10

"We want middle school kids to increase their level of achievement in science and math and for their teachers to increase their level of performance in teaching those subjects."

VOA: standard.2010.05.10