penetration twin

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Adolf Hitler (Nazi, nazism, German leader).

9 Things You Might Not Know About Adolf Hitler

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

Battle of Puebla. Cinco de Mayo. General Porfirio Diaz leads Mexican cavalry to victory against the French lead by General Charles Lorencez at Puebla, Mexico April 2, 1867. Oil on canvas, 1902. May 5, 1862. General Ignacio Zaragoza

The Battle of New Orleans, by E. Percy Moran, c. 1910. Andrew Jackson, War of 1812.

26 Decade-Defining Events in U.S. History

Computer mapping, woman at early 1990s computer

Timeline of the 1990s

German machine gunners occupy a trench during World War I.

Weapons of World War I

Candles Burning On Table In Church

What Is the Most Widely Practiced Religion in the World?

penetration twin

crystallography

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In twinning
Penetration twins are complete crystals that pass through one another and often share the centre of their axial systems.
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