Sam (Smarajit) and Sumita Mitra, a husband-and-wife team of 3M research scientists, display their U.S. patent for copolymerizable UV stabilizers, 1987. Used with the permission of Sam and Sumita Mitra.
Sample from the Hubert H. Humphrey Metrodome's air-supported, ten-acre, Teflon-coated fiberglass fabric roof, which deflated to a snowstorm December 12, 2010.