More Google Video gold, this time a geometry lesson on completely inverting a sphere. I'm posting these for reasons twofold; first, they're new and interesting stuff to me (and to many, I'm sure) and second, they're so much more visual and intuitive than any explanation from another source. What happened 20 or 30 years ago to make people stop creating this kind of stuff?
The Mechanical Universe is a great (albeit really, really old) series of videos from what looks like an intro to physics class at Caltech in 1985. The entire 52-part series is legitimately available on Google video as well as purchasable on DVD! While most of the videos explain basic topics without emphasis on math, they're incredibly visual and conceptual. I literally have not seen a better quality physics video and this series is 22 years old.
Here's a good one: #42, The Lorentz Transformation:
