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.
African Americans
A few other notable examples include the first successful open heart surgery, performed by Dr. Daniel Hale Williams, and the air conditioner, patented by Frederick McKinley Jones. Dr. Mark Dean holds three of the original nine patents on the computer on which all PCs are based. More current contributors include Otis Boykin, whose inventions included several novel methods for manufacturing electrical components that found use in applications such as guided missile systems and computers, and Colonel Frederick Gregory, who was not only the first black astronaut pilot but the person who redesigned the cockpits for the last three space shuttles. Gregory was also on the team that pioneered the microwave instrumentation landing system.