<http://schema.org/mainEntityOfPage>
<http://www.popularmechanics.com/space/deep-space/a9735/why-is-this-rock-worth-400000-dollars-16134667/True>
<http://www.popularmechanics.com/space/deep-space/a9735/why-is-this-rock-worth-400000-dollars-16134667/>