Numerical calculations are grand. Of course, they are just another form of normal calculations - like I have said before. So, I have mostly used [VPython](http ...

Physics and Python stuff. Most of the videos here are either adapted from class lectures or solving physics problems. I really like to use numerical calculations without all the fancy programming ...

Village problem? Is that even the correct name? Who knows? Here is the puzzle: There are four villages arranged such that they occupy the 4 corners of a perfect square. What arrangement of roads could ...