<http://schema.org/headline>
"Scientists accidentally stumble upon world's oldest sperm"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.hindustantimes.com/world/scientists-accidentally-stumble-upon-world-s-oldest-sperm/story-Sqs8IcAXozCNOFh4uOoMEN.html>