<http://schema.org/alternativeHeadline>
"The guy performing on what looked like a tightrope during the Super Bowl halftime show was actually doing something called slacklining."^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.mnn.com/lifestyle/arts-culture/stories/slacklining-obscure-sport-highlighted-during-super-bowl>