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Willem Einthoven (21 May 1860 – 29 September 1927) was a Dutch medical doctor and physiologist. He invented the first practical electrocardiograph (ECG or EKG) in 1895 and received the Nobel Prize in Physiology or Medicine in 1924 for it ("for the discovery of the mechanism of the electrocardiogram").
The Common Core State Standards Initiative, also known as simply Common Core, was an American, multi-state educational initiative begun in 2010 with the goal of increasing consistency across state standards, or what K–12 students throughout the United States should know in English language arts and mathematics at the conclusion of each school grade.
1880–1886: Charles F. Brush of Euclid, Ohio, and Brush Electric Light Company installed carbon arc lights along Broadway, New York City. A small generating station was established at Manhattan's 25th Street. The electric arc lights went into regular service on December 20, 1880. The new Brooklyn Bridge of 1883 had seventy arc lamps installed ...
George Constantinescu (1881–1965), Romania – creator of the theory of sonics, a new branch of continuum mechanics Albert Coons (1912–1978), U.S. – Immunofluorescence (microscopy) Martin Cooper (born 1928), U.S. – Mobile phone
Willem Barentsz (c. 1550–1597), several expeditions to Arctic waters; discovered Spitsbergen; Abraham Blauvelt (1601–1663), Central America; Adriaen Block (1567–1627), New Netherland; Hendrik Brouwer (1580–1643), discovered the Roaring Forties; Olivier Brunel (c. 1540–1585), tried to find a passage around Siberia to China
Mathematician George F. Simmons wrote in the algebra section of his book Precalculus Mathematics in a Nutshell (1981) that the New Math produced students who had "heard of the commutative law, but did not know the multiplication table." [205] By the early 1970s, this movement was defeated. Nevertheless, some of the ideas it promoted still lived on.
Topics introduced in the New Math include set theory, modular arithmetic, algebraic inequalities, bases other than 10, matrices, symbolic logic, Boolean algebra, and abstract algebra. [2] All of the New Math projects emphasized some form of discovery learning. [3] Students worked in groups to invent theories about problems posed in the textbooks.
He wrote 30 books on medicine, the "Pandects". He was the first author in antiquity who mentioned the diseases of smallpox and measles [26] translated by MÄsarjawaih a Syrian Jew and Physician, into Arabic about A. D. 683; c. 630 – Paul of Aegina Encyclopedia in 7 books very detailed surgery used by Albucasis [13] [20] [27]