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 ...

This file includes stroke(), which converts a path into a geometric object, like drawing with a pen. It even works on three-dimensional paths. You can make a dashed line or add arrow heads. The turtle ...

The latest news and headlines from Yahoo News. Get breaking news stories and in-depth coverage with videos and photos.