Lecturer: Hank Green -Entrepreneur, musician, blogger. Together with his brother John Green, he founded Crash Course and SciShow on Youtube. This project was funded by the YouTube "Original Channel" project.

College introduction: Crash Course is a series of courses produced by Hank Green and John Green on YouTube. The course is divided into two parts: world history and biology. The world history part is written by John Green and his high school teacher. They try to use a large number of animations to connect with seemingly irrelevant and seemingly relevant nonsense, and show everyone every part of world history in 10 minutes.

Course introduction: Mr. Hank Green teaches you biology in an interesting way! Thanks to the volunteers who provided translation for the video @ sweet and sour tangerine peel.