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Philosophiae Naturalis Principia Mathematica Published

Newton's Principia represents one of the greatest milestones in the history of science. The three-volume work includes Newton's three famous laws of motion, treatises on dynamics and fluid motion, and an explanation of Kepler's laws of planetary motion. It dominated the scientific view of the physical universe for three centuries after its publication. Although Newton used calculus to derive his results, he explained them using older geometric methods. Why might he have done this?



Plant Reproduction

Unlike animals, plants are immobile and cannot actively seek out partners for reproduction. The first plants were aquatic and used abiotic factors, like water and wind, to carry male gametes to female reproductive structures. As plants moved from water onto land, they developed motile sperm cells that could travel via a thin film of water. Eventually, many plants evolved the pollen and seed structures common today. How do some plants attract the insect pollinators vital to their reproduction?

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, the play La Machine Infernale, 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 Sunday, 5th July 2009

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