<http://schema.org/mainEntityOfPage>
<http://www.upi.com/Science_News/2013/02/26/Gender-gap-in-math-work-studied/14301361912330/>
<http://www.upi.com/Science_News/2013/02/26/Gender-gap-in-math-work-studied/UPI-14301361912330/?spt=hs&or=sn>