There are now nearly 2,500 educational videos for the K-12 set (but the mini-classes would be of benefit to any lifelong learner). Topics include math, biology, chemistry, physics, finance, and history. According to the site, "Each video is a digestible chunk, approximately 10 minutes long, and especially purposed for viewing on the computer."
All the information is available at no cost.
Sample: An algebra lesson with Sal, KA's charismatic founder and master teacher ...
Sidebar: Thanks to A.S. for sending this article about first-grade students at a Cook County ('The Chicago Way') public school who were handcuffed for chatting during class.