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<http://schema.org/url>
<https://npr.brightspotcdn.com/dims4/default/86264c4/2147483647/resize/x60/quality/90/?url=http%3A%2F%2Fnpr-brightspot.s3.amazonaws.com%2F22%2Ffa%2F47ffa18a48e4b46a5c355405ee24%2Ftpr-web-header.png>
<https://www.tpr.org/science-technology/2013-11-06/4-d-printing-means-building-things-that-build-themselves>