VSauce is an interesting YouTube channel that I have followed for a while now. The videos published by VSauce explain the science and math that answers all kinds of fun and interesting questions like "is the 5 second rule true?" "where is the most dangerous place on Earth?" and "will we ever visit other stars?"
Applications for Education
Due to the PG-13 rating that I'd apply to some of the content of some VSauce videos I wouldn't turn my students loose on the whole VSauce channel, but I would use an individual video as part of a science lesson.