<http://schema.org/alternativeHeadline>
"NASA hopes the tests will contribute to making helicopters quicker, quieter, safer, greener and capable of carrying more passengers and cargo."^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.mnn.com/green-tech/transportation/stories/nasa-to-crash-helicopters-in-the-name-of-science-today>