<http://schema.org/alternativeHeadline>
"Experts can't look at an adult skull and know the sex for sure, let alone determine it from a grainy ultrasound."^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.mnn.com/family/babies-pregnancy/stories/can-skull-theory-reveal-sex-of-an-unborn-child>