The Simpsons 27th season had 22 episodes, best I could do. If it's how many in October, it's 4.
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The transcontinental railroad was built in the 1800s to connect Council Bluffs, Iowa, with the San Francisco Bay and revolutionize transport in the U.S.
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Brown v. Board of Education of Topeka, 347 U.S. 483 (1954), was a landmark decision of the U.S. Supreme Court in which the Court ruled that U.S. state laws establishing racial segregation in public schools are unconstitutional, even if the segregated schools are otherwise equal in quality.
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Photosynthesis is a process used by plants and other organisms to convert light energy into chemical energy that, through cellular respiration, can later be released to fuel the organism's activities.
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