It happens at least a few times a day. Students look through our list of 400 Free Online Courses, and ask us whether they can get a certificate for taking a class. And, unfortunately, our answer has been no — no, you can’t. But that may be about to change.

Think of it as the ultimate slow-motion movie camera. Researchers at M.I.T. have developed an imaging system so fast it can trace the motion of pulses of light as they travel through liquids and solids.

The video you’re watching is a real-life demonstration of an optical illusion developed in 1995 by Edward Adelson, a professor in MIT’s Department of Brain and Cognitive Sciences. The Checker Shadow Illusion, as Adelson calls it, shows that our “visual system is not very good at being a physical light meter.

Deb Roy is the director of the Cognitive Machines group at the MIT Media Lab. For the first few years of his son’s life, Roy installed cameras in every room of the family home. Now he jokes that he has the “largest home video collection ever made” – roughly 90,000 hours of images and footage of the growing baby’s world.

Last week, MIT OpenCourseWare officially released its LectureHall iPhone app. Put simply, the free app gives you mobile access to MIT video lectures. It even lets you download lectures straight to your phone (handy for times when you may not have connectivity).

Long ago, long before MIT hatched plans for its OpenCourseWare initiative, the university taped a lecture series covering the equivalent of a freshman-level calculus course. Released in 1970, the introductory class taught by Herbert Gross was suited for any student brushing up on his/her calculus, or learning the subject for the first time.

This week, MIT’s OpenCourseWare project launched OCW Scholar, a new series of courses “designed for independent learners who have few additional resources available to them.” To date, MIT has given students access to isolated materials from MIT courses.

Last week, the launch of Stanford Engineering Everywhere, featuring 10 free computer science and engineering courses, got no shortage of buzz on the net. This led me to think, why not highlight other major collections of free university courses/resources.

For a graduate student in an English Ph.D. program, one of the big milestones on the road to the dissertation is the Oral Exam. In my case this involves five professors, a list of 60-80 books, and two hours in a (rhetorically) smoke-filled room.

The New York Times ran a fascinating article today about the feud between Intel and the One Latop Per Child program run by MIT’s Nicholas Negroponte. If you haven’t heard about it, the initiative is intended to develop a reasonably priced ($200) laptop for primary school children in the third world.