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Paul Klee

Paul Klee (German: [paʊ̯l ˈkleː]; 18 December 1879 – 29 June 1940) was a Swiss German artist. His highly individual style was influenced by movements in art that included Expressionism, Cubism, and Surrealism.

Klee was a natural draftsman who experimented with and eventually deeply explored color theory, writing about it extensively; his lectures Writings on Form and Design Theory (Schriften zur Form und Gestaltungslehre), published in English as the Paul Klee Notebooks, are held to be as important for modern art as Leonardo da Vinci's A Treatise on Painting for the Renaissance.

He and his colleague, Russian painter Wassily Kandinsky, both taught at the Bauhaus school of art, design and architecture. His works reflect his dry humor and his sometimes childlike perspective, his personal moods and beliefs, and his musicality.

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Edith Louisa Cavell

Edith Louisa Cavell (/ˈkævəl/; 4 December 1865 – 12 October 1915) was a British nurse. She is celebrated for saving the lives of soldiers from both sides without discrimination and in helping some 200 Allied soldiers escape from German-occupied Belgium during the First World War, for which she was arrested. She was accused of treason, found guilty by a court-martial and sentenced to death. Despite international pressure for mercy, she was shot by a German firing squad. Her execution received worldwide condemnation and extensive press coverage.

The night before her execution, she said "Patriotism is not enough. I must have no hatred or bitterness towards anyone.", words later inscribed on a memorial to her near Trafalgar Square. Her strong Anglican beliefs propelled her to help all those who needed it, both German and Allied soldiers. She was quoted as saying, "I can’t stop while there are lives to be saved." The Church of England commemorates her in its Calendar of Saints on 12 October.

Cavell, who was 49 at the time of her execution, was already notable as a pioneer of modern nursing in Belgium.

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Charles-Michel de l'Épée

The Abbé Charles-Michel de l'Épée (French: [ʃaʁlmiʃɛl dəlepe]; 24 November 1712, Versailles - 23 December 1789, Paris) was a philanthropic educator of 18th-century France who has become known as the "Father of the Deaf".

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Valdemar Poulsen

Valdemar Poulsen (23 November 1869 – 23 July 1942) was a Danish engineer who made significant contributions to early radio technology. He developed a magnetic wire recorder called the telegraphone in 1898 and the first continuous wave radio transmitter, the Poulsen arc transmitter, in 1903, which was used in some of the first broadcasting stations until the early 1920s.

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Arecibo message

The Arecibo message is a 1974 interstellar radio message carrying basic information about humanity and Earth sent to globular star cluster M13 in the hope that extraterrestrial intelligence might receive and decipher it. 

The message was broadcast into space a single time via frequency modulated radio waves at a ceremony to mark the remodeling of the Arecibo radio telescope in Puerto Rico on 16 November 1974. The message was aimed at the current location of M13 some 25,000 light years away because M13 was a large and close collection of stars that was available in the sky at the time and place of the ceremony. 

The message consisted of 1,679 binary digits, approximately 210 bytes, transmitted at a frequency of 2,380 MHz and modulated by shifting the frequency by 10 Hz, with a power of 450 kW. The "ones" and "zeros" were transmitted by frequency shifting at the rate of 10 bits per second. The total broadcast was less than three minutes.

The number 1,679 was chosen because it is a semiprime (the product of two prime numbers), to be arranged rectangularly as 73 rows by 23 columns. The alternative arrangement, 23 rows by 73 columns, produces an unintelligible set of characters (as do all other X/Y formats). The message forms the image shown on the right, or its inverse, when translated into graphics, characters, and spaces.

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Elisa Leonida Zamfirescu

Elisa Leonida Zamfirescu (November 10, 1887 – November 25, 1973) was one of the world's first female engineers.

Zamfirescu was born in Galați, Romania on November 10, 1887. Her father, Atanase Leonida, was a career officer while her mother, Matilda Gill, was the daughter of a French-born engineer. Her brother was the engineer Dimitrie Leonida.

Due to prejudices against women in the sciences, Zamfirescu was rejected by the School of Bridges and Roads in Bucharest. In 1909 she was accepted at the Royal Academy of Technology Berlin, Charlottenburg. She graduated in 1912, with a degree in engineering. It has been claimed that Zamfirescu was the world's first female engineer, but the Irish engineer Alice Perry graduated six years before Zamfirescu in 1906.

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