English: Ultraviolet lights glow eerily in the windows of Building 7 at night. After Dr. Richard Henderson and Technician Rose Parrott died within weeks of each other in 1944 of infections they acquired on the job at NIH, Surgeon General Thomas Parran was successful in asking Congress for money to build a state-of-the-art laboratory building designed just for dangerous biological studies. Building 7, known as the Memorial Building, sat across the street from Building 5 where Henderson and Parrott had worked, and opened in 1947. Building 7 had a laminar air system and superheated grids to sterilize air as it passed through the ventilation system and ultraviolet lights were turned on each night to help sterilize surfaces. Staff entered laboratories only after going through decontamination locks where they showered and changed clothes. The concrete window canopies replaced fabric shades that might become contaminated. Although the building’s safety features never functioned quite as well as hoped, the construction of Building 7 was a belated recognition of the dangers that NIH staff faced, and that the country wanted no more martyrs to science. Building 7 was demolished in 2015.