TL;DR: A wide range of online courses from MIT are available to take for free on edX.

CAMBRIDGE, Mass.--Imagine you are taking an introductory biology course. You're studying for an exam and realize it would be helpful to revisit the professor's explanation of RNA interference.

While it is becoming increasingly common (and easy) for lectures to be placed online as videos or podcasts, such media can often be very limited in their utility. For example, I missed a lecture last ...

Researchers in MIT's Computer Science and Artificial Intelligence Laboratory (CSAIL) have developed a new Web-based technology that's designed to take recorded classroom lectures to the next level.

Imagine you are taking a biology course. You're studying for an exam and would like to revisit the professor's explanation of RNA interference. Fortunately, a digital recording of the lecture is ...