Have you ever checked out Crash Course? It’s a great YouTube channel with a series of videos on World History, US History, Biology, Chemistry, and more. The whole thing is presented by John Greene (who also happens to have written The Fault in Our Stars) and his brother, Hank. Watching these videos is a fun way to do a little light studying for your history and science classes. Check it out! *NOTE: this should not replace your usual studying habits but enhance them.