Superintendents: A winter(kill) to remember … or forget … across Triad

        By STUART HALL Over time, Kevin Smith may eventually forget the overnight hours of March 29, but what occurred during that time happens so infrequently that it almost becomes historic. Throughout the dark early morning, temperatures took a Titanic-like plunge to a low of 24 degrees, 18 degrees below the historical average for Greensboro. Combined with the 30-degree…