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<http://schema.org/url>
<https://media.npr.org/assets/img/2013/11/06/jerry_qi8ga-570595237fd0d0b02ef6bcef93c77e6262e3ba72.jpg>
<https://www.tpr.org/science-technology/2013-11-06/4-d-printing-means-building-things-that-build-themselves>