At a busy street crossing, people wait for the signal to change. When one person steps out first, others soon follow.

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 ...

Have you ever tried searching Google for answers to your homework, and more specifically, math and science problems? Back in the day, this was a hard feat, as Google would only lead users to websites ...

Researchers in Germany have discovered that slipping on ice is caused by dipole interactions, not friction or temperature.