Piet Hein

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illustration of the walking titanosaurus, Patagotitan mayorum

Titanosaurs: 8 of the World's Biggest Dinosaurs

New Zealand. Political/Physical map. Includes locator.

Where Is “Old Zealand”?

Battle of the Alamo from "Texas: An Epitome of Texas History from the Filibustering and Revolutionary Eras to the Independence of the Republic, 1897. Texas Revolution, Texas revolt, Texas independence, Texas history.

6 Wars of Independence

Groups of depositors in front of the closed American Union Bank, New York City. April 26, 1932. Great Depression run on bank crowd

Causes of the Great Depression

Small, white rat (genus Rattus) on a glass table. (rodent, laboratory, experiment)

Cruel and Unusual Punishments: 15 Types of Torture

Fish. Lionfish. Lion-fish. Turkey fish. Fire-fish. Red lionfish. Pterois volitans. Venomous fin spines. Coral reefs. Underwater. Ocean. Red lionfish swims by seaweed.

10 of the World’s Most Dangerous Fish

Lusitania sinking, illustration from The War of the Nations (New York), December 31, 1919. World War I, WWI. This image is one of three on the page. (See source file for the other two.)

7 of the World’s Deadliest Shipwrecks

Piet Hein

Danish mathematician

Learn about this topic in these articles:

development of mathematical games

In number game: Puzzles involving configurations
The game was created by Piet Hein in 1942 in Denmark, where it quickly became popular under the name of polygon. It was invented independently in the United States in 1948 by John Nash, and a few years later one version was marketed under the name of hex.
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Soma Cubes

In Soma Cube
The Danish mathematician Piet Hein, also known for his invention of the mathematical games known as hex and tac tix, stumbled upon the fact that the seven Soma Cubes can be put together to form a larger cube containing 27 “unit” cubes. He patented his idea for the…
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