The deaths of eight students at a school struck by a tornado in Enterprise, Alabama in 2007 and the deaths of seven others when a tornado struck a school in Moore, Oklahoma in 2013 have spurred building code writers to make the protection of students from tornadoes a priority in the 17 U.S. states commonly referred to as “tornado alley.” The International Building Code 2015 requires new schools in those states to be built with tornado shelters—which is a step in the right direction.But for the approximately 40,000 existing school buildings, averaging 40 years in age, it’s no step at all.