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.
Arthur Frederick Ostrander
Arthur Frederick Ostrander, Sr. (February 14, 1895 – February 1978), was an assistant scientist. He worked with inventor George Poe. In his childhood he worked with Poe (mid-1907 to 1908), who taught him how an artificial respiration device functions. His assistance to Poe was instrumental in the successful development of the respiration device, as he performed the fine detail work and metal fabrication that Poe could no longer do. His face came to be one of the most well known of the time, having been featured in several large circulation newspapers."