Khan Academy

The Khan Academy provides free education through a library of videos covering K-12 math, science topics such as biology, chemistry, and physics, and even reaches into the humanities with playlists on finance and history.

Module 1 : The nature of science

"On successful completion of this module, students should be able to:

Building Open Educational Resources from the Ground Up: South Africa?s Free High School Science Texts

Partly because the development of open educational resources (OER) is a relatively new field that is just now receiving more widespread attention and study, there have been few opportunities to share knowledge across program, organizational and national bo