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irrational number
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Equations written on blackboard
Numbers and Mathematics
barometer. Antique Barometer with readout. Technology measurement, mathematics, measure atmospheric pressure
Fun Facts of Measurement & Math
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bunch of numbers
Unusual Counting Systems
number zero, 0 balloon
Is Zero an Even or an Odd Number?
Galaxy clusters like Abell 2744 can act as a natural cosmic lens, magnifying light from more distant, background objects through gravity. NASA's James Webb Space Telescope may be able to detect light from the first stars in the universe if they are gravitationally lensed by such clusters. (astronomy, space exploration, galaxies)
How Fast Is the Universe Expanding?
Discover
Currency. Money. Cash. Dollars. Bills. Pile of ten, twenty, fifty, and hundred dollar bills.
6 Questions About the History of Money and Banking Answered
Illustration for Demystified "How Dangerous is Quicksand"
How Deadly Is Quicksand?
Two chicks near an egg with a white background (poultry, chick, chickens, birds).
What Do Eggs Have to Do with Easter?
King Cobra snake in Malaysia. (reptile)
9 of the World’s Deadliest Snakes
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?
Shah Jahan. Taj Mahal. Mughal architecture. Emperor Shah Jahan fifth Mughal Emperor (reigned 1628-1658) India, Himachal Pradesh, Basohli or Jammu and Kashmir, Mankot, circa 1690 Drawings; Opaque watercolor, gold, and ink on paper (see notes)
6 Important Mughal Emperors
Hemp (Cannabis sativa).
9 Mind-Altering Plants

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Key People

Eudoxus of Cnidus
Greek mathematician and astronomer
Dedekind
Richard Dedekind
German mathematician
Johann Lambert, detail of a lithograph by Gottfried Englemann, after a portrait by Pierre-Roch Vigneron
Johann Heinrich Lambert
Swiss-German scientist and philosopher
René-Louis Baire
French mathematician
Theaetetus
Greek mathematician

Related Quizzes and Features

Quiz
Equations written on blackboard
Numbers and Mathematics
barometer. Antique Barometer with readout. Technology measurement, mathematics, measure atmospheric pressure
Fun Facts of Measurement & Math