Penrose diagram

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A Factory Interior, watercolor, pen and gray ink, graphite, and white goache on wove paper by unknown artist, c. 1871-91; in the Yale Center for British Art. Industrial Revolution England

Inventors and Inventions of the Industrial Revolution

Diverse elementary school children wearing school uniforms running outside of school. Boys girls

Pro and Con: School Uniforms

Santa Claus flying in his sleigh, christmas, reindeer

Was Santa Claus a Real Person?

Baseball laying in the grass. Homepage blog 2010, arts and entertainment, history and society, sports and games athletics

10 Greatest Baseball Players of All Time

Thanksgiving Turkey with all the sides

Why Do We Eat Turkey on Thanksgiving?

Woman tied to a ducking stool, a method of punishment by means of humiliation, beating, or death. (cucking stool)

8 Unusual Punishments Inflicted on Women Throughout History

Rural Irish landscape, Sligo, Ireland.

Why Is Ireland Two Countries?

Penrose diagram

physics

Learn about this topic in these articles:

space-time near black holes

In Roger Penrose
…map, which is called a Penrose diagram, allows one to visualize the effects of gravitation upon an entity approaching a black hole. He also discovered Penrose tiling, in which a set of shapes can be used to cover a plane without using a repeating pattern.
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