wrote about the YouTube channel Crash Course. At that time I was highlighting the Crash Course history videos. Today, I want to point out the science videos. Crash Course is now up to six biology videos. Like the history videos, the biology videos are rather fast-paced and in a couple of spots make some borderline inappropriate comments But as a general rule, the Crash Course videos should be okay for high school students (use your discretion, what's okay at my school might not be okay at your school, before showing the video to a classroom).