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.
Elie Aghnides
Aghnides' first major invention was the faucet aerator, which is a standard part of nearly all faucets today, in 1943. He said he got the idea from watching a waterfall. He also had a number of related patents throughout the years stemming from his original invention. This invention and its subsequent modifications and additions made him very wealthy. He kept luxury apartments in both New York City and Paris.