Our 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. The Khan Academy is a not-for-profit educational organization, created in 2006 by Bangladeshi American educator Salman Khan, a graduate of MIT. With the stated mission of "providing a high quality education to anyone, anywhere", the website supplies a free online collection of more than 2,600 micro lectures teaching mathematics, history, finance, physics, chemistry, biology, astronomy, economics and computer science.

A six-part BBC series looks at the newest research from around the world to find out what could it be that makes us happy.
We all want to be happy but the problem has always been that you cant measure happiness.
Happiness has always been seen as too vague a concept, as Lord Layard, Professor of Economics at the LSE and author of "Happiness - lessons from a new science" points out.