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 ...

Sumo Paint is a more advanced tool for those who want to draw and paint directly in the browser. It’s also available as a regular computer program. However, the latter requires a paid subscription.

Test your focus with this optical illusion: a vibrant park scene hides a subtle purple flower at a tree’s base. Can your eyes ...