GrokEarth: Earth & Moon Phases

Many living organisms, inanimate objects, and geologic formations have polygonal shapes. Polygons are a chain of straight segments...

10/15/16 Prairie Dust

On Black Sunday, April 14, 1935, sixty mile per hour winds buffeted North American prairie land displacing some 300 million tons...

10/8/16 Looking Glass Light

In Six Lectures on Light: Delivered in America in 1872-1873, physicist John Tyndall observed that the human construct of Nature is...

10/1/16 The Human Imprint

Humans are changing Earth on a massive scale. Nothing is made, nothing disappears. The same changes, at the same places, never stopping...