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Leonhard Euler (/ ˈ ɔɪ l ər / OY-lər, [b] German: [ˈleːɔnhaʁt ˈʔɔʏlɐ] ⓘ, Swiss Standard German: [ˈleːɔnhart ˈɔʏlər]; 15 April 1707 – 18 September 1783) was a Swiss mathematician, physicist, astronomer, geographer, logician, and engineer who founded the studies of graph theory and topology and made pioneering and influential discoveries in many other branches of ...
Úrsula Hilaria Celia de la Caridad Cruz Alfonso was born on 21 October 1925, at 47 Serrano Street in the Santos Suárez neighborhood of Havana, Cuba. [7] [8] Her father, Simón Cruz, was a railway stoker, and her mother, Catalina Alfonso Ramos, a housewife who took care of an extended family. [7]
Ruth Aiko Asawa was born in 1926 in Norwalk, California and was one of seven children. [7] [8] [9] Her parents, immigrants from Japan, operated a truck farm until the Japanese American internment during World War II. [10]
The P&T started to issue topical and commemorative stamp series independently. International agents or organizations can make proposals to issue postage stamps, which upon agreement may be issued against a royalty. IGPC would be one of them and keep a contract for the production of postal stamps until at least the year 2004. [29]
During the first seven weeks of the Civil War, the U.S. Post Office still delivered mail from the seceded states. Mail that was postmarked after the date of a state's admission into the Confederacy through May 31, 1861, and bearing U.S. (Union) postage is deemed to represent 'Confederate State Usage of U.S. Stamps'. i.e., Confederate covers franked with Union stamps. [4]
Frederic Ogden Nash (August 19, 1902 – May 19, 1971) was an American poet well known for his light verse, of which he wrote more than 500 pieces.With his unconventional rhyming schemes, he was declared by The New York Times to be the country's best-known producer of humorous poetry.
In 1859, when Edmonia Lewis was about 15 years old, her brother Samuel and abolitionists sent her to Oberlin, Ohio, where she attended the secondary Oberlin Academy Preparatory School for the full, three-year course, [19] before entering Oberlin Collegiate Institute (since 1866, Oberlin College), [20] one of the first U.S. higher-learning institutions to admit women and people of differing ...
Perestroika (/ ˌ p ɛr ə ˈ s t r ɔɪ k ə /; Russian: перестройка, IPA: [pʲɪrʲɪˈstrojkə] ⓘ) [1] was a political reform movement within the Communist Party of the Soviet Union (CPSU) during the late 1980s, widely associated with CPSU general secretary Mikhail Gorbachev and his glasnost (meaning "transparency") policy reform.