NASA's YouTube channel always provides highly visual content of different objects in space, but I'm a huge fan of their solar flare footage and animations.
The NASAexplorer channel has another one up today - this time with "the most comprehensive movie ever of a mysterious process at the heart of all explosions on the sun: magnetic reconnection. Get a quick primer on what this means and watch some very cool solar explosions while you're at it.
Keith Shaw rounds up the best in geek video in his ITworld.tv blog. Follow Keith on Twitter at @shawkeith. For the latest IT news, analysis and how-tos, follow ITworld on Twitter, Facebook, and Google+.