TRENDING ON YOUTUBE: Sure, Korea's "Gangnam Style" music videos have been swarming our Facebook and Twitter feeds as of late. (Really, more than 67 million views in just over a month?) But here's a surprise: educational videos--science, in particular--are also trending hotly, according to YouTube's trends manager, Kevin Allocca. One of the recent top searches? Bill Nye the Science Guy's plea to creationists to keep their views to themselves.