“Quilting is mostly singing,” according to Nettie Young of Gee’s Bend, Alabama. Like singing, quilting is often a communal activity. Quilters gather to cut, piece, and stitch layers of fabric together ...

A 3D shape with all straight edges and flat faces is a polyhedron. Other 3D shapes with least one curved surface are not polyhedra. A 3D shape with regular polygonal faces, meeting at equal angles, is ...

Hexagonal binning is useful for aggregating data into a coarser representation for display. For example, rather than rendering a scatterplot of tens of thousands of points, bin the points into a few ...

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