Entertainer and author Janelle Monáe performs during the 2019 Grammys flanked by android-like backup dancers. Kevin Winter/Getty ImagesThe new sci-fi musical “Neptune Frost,” set in a Rwandan village constructed with computer parts, tells the story of an intersex hacker and a coltan miner who lead an anarchist uprising against their oppressors. The film – lauded for its “Afrofuturist vision” – is only one of the more recent works to engage in the transformative speculation of Afrofuturism, a cul