April | 2013 | RobertLovesPi.net

Rotating Polyhedral Helix

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Rotating Polyhedral Helix

It’s made of metabidiminished rhombicosidodecahedra, and can be continued indefinitely.

Software credit, for the program used to create this .gif: see http://www.software3d.com/Stella.php for download and trial demo.

A Second Repeating Tessellation of Regular Polygons Which Lacks Vertex-Transitivity

A Repeating Tessellation of Regular Polygons Which Lacks Vertex-Transitivity

An Unusual Tessellation Featuring Regular Hexagons, Equilateral Triangles, and Squares

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An Unusual Tessellation

This tessellation uses equilateral triangles and regular hexagons with unit edge length, and squares with twice that edge length.

The Pegasus Crude Oil Pipeline

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The Pegasus Crude Oil Pipeline

I live quite near Mayflower, Arkansas, site of an oil spill and ongoing cleanup efforts. You’ve probably seen it in the news.

Living in a landlocked state, we did not have “oil spill” on our worry-lists here.

You may live near this pipeline, too, and not even know it. That’s why I’m posting this map (which I did not create, but simply found with a Google image-search). There may be other such pipelines here, as well. Few people notice them — until one breaks.

Richard Feynman, on Respect and Authority

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Richard Feynman, On Respect and Authority

Mark Twain, on Idiots and Lightning

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Mark Twain On Idiots and Lightning

[Later edit, in October 2015: a friend of mine questions the authenticity of this quote, but did find a source for Mark Twain saying this: “The trouble ain’t that there is too many fools, but that the lightning ain’t distributed right.” He may well be correct; my friend is an expert at detecting false quotations. If anyone knows of a source for the quote in the pic above, please leave a note about it in a comment to this post.]