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Vannevar Bush with Differential Analyzer

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bunch of numbers

Unusual Counting Systems

J. Robert Oppenheimer (L) & Gen. Leslie R. Groves at ground zero examine remains of a base of the steel test tower at the Trinity Test site of a nuclear bomb; as part of the Manhattan Project in New Mexico, Sep. 1945. Los Alamos National Laboratory

Timeline of the Manhattan Project

number zero, 0 balloon

Is Zero an Even or an Odd Number?

Discover

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

Nazi Germany, Nazi SS troops marching with victory standards at the Party Day rally in Nuremberg, Germany, 1933. (Schutzstaffel, Nazi Party, Nurnberg)

Why Was Nazi Germany Called the Third Reich?

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

King Cobra snake in Malaysia. (reptile)

9 of the World’s Deadliest Snakes

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

The impeachment trial of Pres. Andrew Johnson, illustration from Frank Leslie's Illustrated Newspaper, March 28, 1868.

What If the President Is Impeached?

Queen Elizabeth II addresses at opening of Parliament. (Date unknown on photo, but may be 1958, the first time the opening of Parliament was filmed.)

All 119 References in “We Didn’t Start the Fire,” Explained

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Topics

disk-and-wheel integrator integraph stability separation of variables direction field singular solution variation of parameters

Key People

Vannevar Bush with Differential Analyzer

Vannevar Bush

American engineer

Douglas R. Hartree

English physicist and mathematician