Learners TV, like many similar sites on the Internet, offers an index of math and science video lessons. What makes Learners TV a little different is that it also has an index of more than 400 science concept animations. The science animations on Learners TV are organized into three categories; biology, physics, and chemistry. Please not that the animations require Flash and that you may have to be patient while they load.
Applications for Education
If you're looking for some animations to illustrate concepts mentioned in your science lessons, take a look at the Learners TV gallery of animations. I think it would be great if Learners TV had paired the animations to specific videos in their libraries, but that could be a project for students.