Science gadgets - This is a optical prism made of high quality K9 grade crystal glass. All surfaces of this little prism can be refracted, and it presents different at different angles in the same ...

The production of books, alongside the increase in literate citizens, created a demand for mass production. Experiments with convex lenses eventually led to what people use for farsightedness today.

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The "quincunx" style adds a vertex in the center of each quadrilateral and creates four triangles, and the "convex" and "concave" styles choose the locally convex/concave subdivision. The "min_area" ...