Solid objects can be printed from liquid resin in mere minutes. With a trick of chemistry, researchers have sped up, and smoothed, the process of three-dimensional (3D) printing, producing objects in ...

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Q:I hope you can suggest something that will remove a stubborn stain from my fiberglass shower pan. I have used a product called Zap, X14 and a few others to no avail. Can you help me? Thank you. A: ...