KINGSPORT — As construction of the Regional Science and Technology Center at Dobyns-Bennett gets underway this month, did you know that things that were valued when the school was built have changed dramatically? And did you know local Presbyterian and Methodist churches once housed high school operations in what became Kingsport? Wall-to-wall carpeting and a single window per classroom, required by law for fire escape, will be replaced by hard surface flooring and a literal wall of windows in the new addition to D-B, which had a groundbreaking on Dec.