Air conditioning
Modern air conditioning emerged from advances in chemistry during the 19th century, and the first large-scale electrical air conditioning was invented and used in 1902 by US inventor Willis Carrier. The introduction of residential air conditioning in the 1920s helped enable the great migration to the Sun Belt in the United States.
Claude Gordon Douglas
Claude Gordon Douglas FRS (26 February 1882 in Leicester – 23 March 1963 in Radcliffe Infirmary, Oxford) was a British physiologist, known for his research on respiratory physiology and the invention of the Douglas Bag.