SciShow: The Smallest Star

Perhaps you've heard of Hank Green; he and his brother John make videos on YouTube. Lots of videos, covering a million different topics. They do too many things to adequately describe here; you can get a taste at Hank's site, and at John's. Be prepared to give it a few hours, since the Vlog Brothers are something of a juggernaut online. They put together a great science video series called SciShow, where different hosts talk about various fun and fascinating topics in science. It's short, simple...