UAW members vote to allow strike on GM, Ford or Fiat Chrysler if needed, Detroit's historic Book Tower is getting a top-to-bottom revival, Detroit Superintendent Nikolai Vitti shared the six things he looks for in a classroom with opinion writer Nancy Kaffer, Detroit Red Wings defenseman Niklas Kronwall retires after 15 seasons, but will join the front office staff, and the Detroit Public Library goes fee free.