User blog comment:Sparklyplatypus/"Are You Smarter Than an Xth Grader?"/@comment-4209592-20111115200850/@comment-3126828-20111116025021

Because it allows water to have surface tension and for some animals (Jesus Christ Lizard) to run across water. Check out the awesome lizard :D -> http://www.youtube.com/watch?v=QK9mcn0Bnfg