You've probably heard of 3D printing--but now there's 4D printing, making materials that can change shape over time. The U.S. Army has invested $855,000 in three universities to develop the technique.
You've probably heard of 3D printing--but now there's 4D printing, making materials that can change shape over time. The U.S. Army has invested $855,000 in three universities to develop the technique.
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