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Table of Contents

Introduction References & Edit History Related Topics

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Unusual Counting Systems

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Is Zero an Even or an Odd Number?

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What Is the Most Widely Practiced Religion in the World?

Portrait of Marie Antoinette by Jean-Francois Janinet, 1777. Color etching and engraving with gold leaf printed on two sheets, 30x13.5 in.

Did Marie-Antoinette Really Say “Let Them Eat Cake”?

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Timeline of the Space Race, 1957–69

Germans from East and West stand on the Berlin Wall in front of the Brandenburg Gate in the November 10, 1989, photo, one day after the wall opened.

Timeline of the 1980s

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

Thumbnail for flags that look alike quiz Russia, Slovenia, Iceland, Norway

Flags That Look Alike

German machine gunners occupy a trench during World War I.

Weapons of World War I

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Topics

real number absolute value

Key People

Dedekind

Richard Dedekind

German mathematician