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Neil deGrasse Tyson @neiltyson
@mechjacktv @NYRangers @TheGarden @StanleyCup Sounds like you already know the answer. All scientific discoveies build on previous work. Henrietta Leavitt in 1908, eighteen years earlier. Hubble’s discovery was enabled by his monster 100-inch telescope on Mt. Wilson, California. — PolitiTweet.org