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The first Democratic debate brought renewed attention to busing as a tool of school desegregation. We spoke to a colleague about what the conversation has been missing. Guest: Nikole Hannah-Jones, who writes about racial injustice for The New York Times Magazine. For more information on today\u2019s episode, visit nytimes.com/thedaily.\xa0\n\nBackground reading:\xa0\u201cThe school bus, treasured when it was serving as a tool of segregation, became reviled only when it transformed into a tool of integration,\u201d Nikole Hannah-Jones writes in a news analysis.