I go to online school and we don't have texts books, I went through the lesson and couldn't find it anywhere. This sucks my paper is due by midnight or I'll get a 20% credit taken off for it being late.
Have you done some research online - besides here I mean? I seem to remember something about China not telling how silk was made for a long time so that they could remain the sole source of the material. But, I can't recall anything else (I'm a middle school teacher).