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Neil deGrasse Tyson @neiltyson
@skyglowberlin Sorry for the delay. Thanks for your queries. (1) James Joyce rhymed quark with mark, which is the literary origin of the particle's name. (2) The Kelvin sentence is clearly a mistake. Thanks for catching it. Will fix in the next printing. FYI: The book's target age is 8-12. — PolitiTweet.org