<http://schema.org/image>
<http://pop.h-cdn.co/assets/cm/15/05/54cb09e00d804_-_nasa-3d-printing-01-0213-mdn.jpg>
<http://www.popularmechanics.com/space/rockets/a8726/3d-printers-to-build-nasas-spare-parts-rocket-engines-15146569/?click=pm_latest>