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If Thales hadn't observed the rubbing an ambar dipstick with a skin or wool, he wouldn't known that it can produce little charges that can bring little objects, and rubbing for a long time, can appear a spark.
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If William Nicholson did hadn't worked on the batterys in his laboratory, he wouldn't discovered the electrolysis accidentally, and it did hadn't allowed a discovered of chemical elements
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If Dimitri Mendeleiev hadn't created the periodic table of chemical elements, we don't could understood the nature and the differents chemical reactions, and maybe we couldn't have knowledge about nuclear process
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If Röntgen hadn't analysed the electrons, he wouldn't discovered the X rays on his laboratory.
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If the nuclear bomb hadn't been invented, USA wouldn't attacked to Japan, and the people hadn't genetics problems
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If we hadn't knowledge about chemical elements like Uranio or Plutonio, Leo Szilard couldn't invent the atomic bomb.
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If we hadn't knowledge about nuclear process, the nuclear reactors wouldn't been created and its use never had been popular for energy production
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If Rosaline Franklin hadn't used the ray x difraction, she wouldn't gound out the DNA structure.
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If Maurice Wilkins hadn't given to Crick and Watson the Rosaline Franklin work, they hadn't discovered the DNA
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If nuclear reactors hadn't been invented, the nuclear accident in chernobyl wouldn't had occurred and the people around chernobyl reactor hadn't had genetic problems.
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If the DNA hadn't been structured, the human genome wouldn't been discovered by Department of Energy`s Office of Science and National Institutes of Health of the USA