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Philosophiae Naturalis Principia Mathematica Published

Newton's Principia, a 3-volume work, represents one of the greatest milestones in the history of science. Volume 1 focuses on dynamics and includes Newton's 3 famous laws of motion; the 2nd portion details fluid motion and other topics; and the 3rd part is an essay on universal gravitation, including an explanation of Kepler's laws of planetary motion. Although Newton used calculus to derive his results, he explained them by use of older geometric methods. Why might he have done this?




Gelatin is a foodstuff largely composed of denatured collagen, a protein that is readily digested and absorbed. It is found in the connective tissue of the cartilage, hoofs, and tendons of vertebrate animals and is extracted by the action of boiling water or dilute acid. Gelatin swells to an elastic, transparent mass when placed in contact with cold water and takes up to 10 times its own weight. It is an important food stabilizer, thickener and texturizer. What is gelatin's ballistic use?

Born on a day like today


Jean Cocteau

Cocteau was a French author and filmmaker who worked in nearly every artistic medium. His versatile, unconventional approach and enormous output brought him international acclaim, and he is best known for the novel Les Enfants Terribles (1929), the play The Infernal Machine, and the film Beauty and the Beast. Despite his achievements in virtually all literary and artistic fields, Cocteau insisted that he was primarily a poet. What was his connection to Pablo Picasso?

Last updated on Thursday, 5th July 2007

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