<http://schema.org/alternativeHeadline>
"I write a belated birthday note to Willis Carrier's world-changing invention known as air conditioning. A day late, yes, but it was too hot out yesterday to celebrate much of anything."^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.mnn.com/your-home/at-home/blogs/a-belated-110th-happy-birthday-to-you-air-conditioning>