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I love that math can be touched in this way

and geometry, and physics, and so MUCH more.

3D Printing or serious waste management? Both, of course

3D printing must minimize both the plastic not reused today, AND the one produced tomorrow.

"3d printed food" means 3 VERY different things

At least three, that is. Not equally realistic, or fair.

The concrete dangers of cement

An ugly title for a very serious topic.