Air conditioning
In 1902, the first modern electrical air conditioning unit was invented by Willis Carrier in Buffalo, New York. After graduating from Cornell University, Carrier found a job at the Buffalo Forge Company. There, he began experimenting with air conditioning as a way to solve an application problem for the Sackett-Wilhelms Lithographing and Publishing Company in Brooklyn, New York. The first air conditioner, designed and built in Buffalo by Carrier, began working on 17 July 1902.
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.