1. Freestyle skiing as a competitive sport evolved from "hot-dog" skiing in the United States in the 1960s, even though stunt skiing has been practiced since the 1930s.
2. Once banned because it was deemed too dangerous, aerial skiing made its Olympic debut in Lillehammer in 1994.
3. The United States has won only three of 18 medals in freestyle skiing despite having dominated the World Cup circuit for more than a decade.