Sunday, December 15, 2013

Free Chemistry Courses

This site includes 3 courses: Intro, General, and Organic chemistry. The lectures require a login. The lecture slides, though, make a nice course and are free, as is the textbook, worksheets with answers, and other materials.  Definitely college level, but not complicated.

Saturday, December 14, 2013

Black Holes

This is an awesome lesson on Black Holes, complete with a journey to a couple of different black holes.  Animated, accurate, and interesting.