YouTube has had quite a year. Today it announced that all told, the site saw more than one trillion playbacks in 2011. Awful videos are, of course, ubiquitous on YouTube (the #1 video on the site for the year that didn't come from a major music label was Rebecca Black's "Friday"), but the most-watched science videos of 2011 are, as you can see below, awesome.
The Top 5 Most-Watched Science Videos on YouTube in 2011
YouTube broke the bank (or the Internet) with more than one trillion playbacks in 2011. Here are the five most-watched videos about science.