<http://schema.org/alternativeHeadline>
"The granddaddy of causality dilemmas has a solution, and we\u2019ve got the simple science to explain it."^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.mnn.com/earth-matters/animals/stories/finally-answered-which-came-first-the-chicken-or-the-egg>