<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://pop.h-cdn.co/assets/cm/15/05/54caa9f3573aa_-_splash_slideshow_495x170_072110.jpg>
<http://www.popularmechanics.com/adventure/sports/a5967/physics-of-cannonball-splash/>