Informally, a dynamic system is any physical system that evolves with time (e.g., a pendulum, a planet orbiting the sun, the weather, etc). From a more mathematically precise perspective, one can ...

Sophia, which operates a free online social teaching and learning platform, this morning announced that it has acquired Guaranteach, a Web-based service that provides tens of thousands of short-form ...

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 ...