Edit #2: Several people have objected to the imagery of "tribal" in the video. You're absolutely right, and I see how the imagery can take away from the message. I was trying to symbolize "cavemen," but I just suck at drawing. My apologies. It was never meant to symbolize Native American tribes.
Edit #1: Well, this video has blown up (6+ million views on Facebook)! And a lot of people have asked for citations to studies. Here are some of the studies I referenced in the video.