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1525
The square root symbol is introduced for square roota
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Pascal discovers his theorem while only 16 years old
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Torricelli's Trumpet is discovered by Evangelista Torricelli
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Newton and Leibniz take the first steps in calculus
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William Jones introduces the sybol for pi
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Euler first uses the sybol i to represent the square root of -1
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Lambert proves that pi is irrational
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Comte de Buffon uses a needle to estimate the value of pi
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Joseph Huddart invents the three armed protractor
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Factorial notation n! is introduced by French mathematician Christian Kramp
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Emile Borel introduces the concept of normal numbers as a way to characterize the digits of pi
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the first cash register is invented by James Ritty
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the klein bottle is first described
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The fields medal is first awarded
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Richard von Mises proposes the birthday problem
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the ulam spiral is discovered
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The game of sprouts is discovered
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the worlds largest superegg is placed outside Kelvin Haill in Glasgow
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Hewlet- Packard introduces the dirst scientific pocket calculator
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Rubik's cube cube is invented
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Sudoku- like games are introduced in the US
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the eternity puzzle s released commercially
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numb3rs hits american telivision