Calvin Coolidge John Harrison (longitude) Joseph Whitworth (screws) CE Johansson (gauge blocks) Malcolm McLean (shipping container) Norman Borlaug (green revolution, although he's got plenty of acknowledgement for that) Fritz Haber and Carl Bosch (Haber-Bosch process for fixing nitrogen --> ammonia --> fertilizer) Thomas Midgley (leaded gasoline AND chlorofluorocarbons...) eh that's just 4 mins of thought