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Carl Sagan: In science it often happens that scientists say, ' You know that's a really good argument; my position is mistaken,' and then they would actually change their minds and you never hear that old view from them again. It doesn't happen as often as it should, because scientists are human and change is sometimes painful. I cannot recall the last time something like that happened in politics or religion.
(1987) ...(more by Sagan) Albert Einstein: I used to wonder how it comes about that the electron is negative.
She started the Women's Research Club at the University of Michigan to encourage research by women, and served as its president for several years.« German botanist and plant cytologist who accurately described the embryonic sac in gymnosperms (such as conifers) and angiosperms (flowering plants), along with demonstrating double-fertilization in angiosperms.
He recognized that new cell nuclei can only result from the division of other nuclei and showed that the sperm and the egg have half the number of chromosomes found in body cells.
Negative-positivethese are perfectly symmetric in physics. There is no reason whatever to prefer one to the other. I thought about this for a long time and at last all I could think was It won the fight!
...(more by Einstein) Richard Feynman: It is the facts that matter, not the proofs.
His most famous work, Kings and Kingdoms of the Mixteca, was finished only a few days before he died in 1970. Lydia Maria De Witt (née Adams) was an American experimental pathologist who investigated the chemotherapy of tuberculosis.
English naval architect and engineer who founded the Thornycroft shipbuilding company, in 1864 with a shipyard on the River Thames.His first book, El mapa de Teozacoalco, (1949), is a key to Mixtec history.For 40 years, he studied prehispanic writing, striving to decipher the forgotten inscriptions.Technetium occupied a hitherto unfilled space in the body of the Periodic Table, and was the first man-made element not found in nature.Astatine exists naturally only in exceedingly small quantities because as a decay product of larger atoms, and having a half-life of only a few days, it quickly disappears by radioactively decay to become atoms of another element. Mexican archaeologist and government official who explored the early Oaxacan cultures and is best remembered for his excavation of Tomb Seven at Monte Albán, the earliest-known North American necropolis.Early in his career, he worked on radio navigation beacons for the Airways division of the Bureau of Lighthouses (1927-28), as radio engineer on the Byrd Antarctic expedition (1928-30). Emilio Gino Segr was an Italian-American physicist who shared (with Owen Chamberlain) the 1959 Nobel Prize for Physics for the discovery of the antiproton, an antiparticle having the same mass as a proton but opposite in electrical charge.He also created atoms of the man-made new element technetium (1937) and astatine (1940).He coined the terms cytoplasm for the fluid found in a cell and nucleoplasm (1882) for the fluid found in the nucleus.The upward movement of sap in trees was demonstrated by his research to be physical, rather than a physiological, process.« Granville Stanley Hall was an American psychologist who distinguished experimental psychology in the U. from the philosophical psychology that dominated in America at the time.These were tested in animal studies for their potential as an anti-tuberculosis drug.She also conducted influential investigations on the anatomy of the nervous system and on public health practices.