I *just* today found a lovely online Science course. It has live teleclasses for chemistry experiments as well as a full curriculum right from K through to 12! It's run by a former NASA rocket scientist, and is aimed at homeschoolers, but I cannot see why anyone couldn't do it and really enjoy it.

http://www.superchargedscience.com/

Mom to 3 gorgeous boys: Aiden (8), Nathan (7) and Dylan (4)