Note: This video is designed to help the teacher better understand the lesson and is NOT intended to be shown to students. It includes observations and conclusions that students are meant to make on ...

Note: This video is designed to help the teacher better understand the lesson and is NOT intended to be shown to students. It includes observations and conclusions that students are meant to make on ...

A reader recently requested a chemistry lesson about bismuth. Why?? Beats me. It takes all kinds. Some people eat sweetbreads and some like nipple clamps. What follows may or may not be worse. And, by ...