A massive explosion lit up the skies over Medina, Saudi Arabia, near the Prophet’s Mosque, Islam’s second holiest site. The September 11 incident triggered panic among residents and visitors as videos ...

This is read by an automated voice. Please report any issues or inconsistencies here. Roger John Nielsen, 34, died after an encounter with police officers this week, the Los Angeles Police Department ...

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 ...