SciShow
The History (And Future!) of the Chemistry Set
Whatever happened to chemistry sets? They turned entire generations of children on to chemistry, and they also have their own illustrious history. Hank takes you through a tour of the chemistry set over time, and tells you how you can be...
Khan Academy
Khan Academy: Improper Integrals: Introduction to Improper Integrals
Watch a video to explore an introduction to improper integrals.