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  1. 20th century 1900s. 1900 – Sigmund Freud published The Psychopathology of Everyday Life. 1903 – John B. Watson graduated from the University of Chicago; his dissertation on rat behavior has been described as a "classic of developmental psychobiology" by historian of psychology Donald Dewsbury.

  2. 3rd century BC: Archimedes calculates areas and volumes relating to conic sections, such as the area bounded between a parabola and a chord, and various volumes of revolution. 3rd century BC: Archimedes discovers the sum/difference identity for trigonometric functions in the form of the "Theorem of Broken Chords".

  3. Jan 10, 2020 · J ust as the reign of Queen Elizabeth I would last into the first years of the seventeenth century, fashion trends of the 1590s would also endure into the new century. . Daniel Delis Hill confirms this in The History of World Costume and Fashion (2011), writing that “at the beginning of the seventeenth century, women’s clothing retained many of the contours and design elements from the end ...

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