<http://schema.org/alternativeHeadline>
"NASA helps the makers of 'Angry Birds' develop the physics needed for the latest version of the super-popular mobile game."^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.mnn.com/earth-matters/space/stories/one-small-slingshot-for-man-one-giant-leap-for-angry-birds>