[The American Lion]

Biology
National Center for Science Education
http://www.youtube.com/user/NatCen4ScienceEd
This channels has tons of lectures mainly on Darwin, Evolution, and education teachers about biology.

Growing Up in the Universe

Richard Dawkins brilliant series about Evolution

Cosmology, Astronomy, & anything Space related
A Universe From Nothing (Lecture)
By Lawrence Krauss

He talks about the universe and how it could be created from nothing.

Cosmos: A Personal Voyage
By Carl Sagan
http://www.hulu.com/cosmos
His great series by PBS during the early 1980s. This was Carl Sagan's homage to science and the cosmos.

Physics
Richard Feynman: The Character of Physical Law
http://topdocumentaryfilms.com/richard- ... sical-law/

His 6 hour lecture from 1964 at Cornell University. What is included. The law of gravitation – an example of physical law, The relation of mathematics to physics, The great conservation principles, Symmetry in physical law, The distinction of past and future, Probability and uncertainty – the quantum mechanical view of nature, and Seeking new laws.