Russia ๐ท๐บ @Russia
#OTD in 1869, renowned Soviet physicist Sergey #Chaplygin was born. โ๏ธ His discoveries lead to creation of gas dynamics - a crucial science for aviation. Decades later, it helped to predict the behavior of an aircraft wing when approaching the speed of sound โ๏ธ https://t.co/8QD5nknk4E — PolitiTweet.org