Over 2,100 instructional videos…F*R*E*E! A ‘knowledge map’ will even chart your progress for you (or your student). Tremendous resource!
A non-profit, Khan Academy offers students an extensive video library, practice exercises, and assessments from any computer with access to the web. Their library of videos covers K-12 math, science topics such as biology, chemistry, and physics, and even reaches into the humanities with playlists on finance and history. Each video is a digestible chunk, approximately 10 minutes long, and especially purposed for viewing on the computer.