Marcel Duchamp is getting a homecoming: The French-born artist, who revolutionized modern art when he flipped a urinal upside down in 1917, spent the last quarter-century of his life in our beloved city. Now, for the first time in more than 50 years, he gets a comprehensive solo exhibition here — his show at MoMA opened to the public this past weekend. Don't miss our interview with Duchamp scholar Thierry de Duve, who walks us through how Duchamp delivered history. It's funny, I think about another iconic Duchamp movement: his presentation of "Nude Descending a Staircase, No. 2" (1912) at the Armory Show, and the subsequent uproar in American publications, certain of which are included in the MoMA show. Well, we continue the tradition this week. First, GRIT, a collective of artists from Appalachian communities, pens a rebuttal to a review of Fia Baström's exhibition at the Queens Museum that we published in these pages.…