Who first came up with a slush?

The concept of a slush drink is often attributed to a combination of efforts in the 1950s and 1960s, with one notable figure being Omar Knedlik, who invented the first slush machine in 1959. His invention allowed for the creation of frozen beverages, which became popular at convenience stores and fast-food restaurants. While similar icy drinks existed before, Knedlik's machine popularized the modern slush we know today.