Slang refers to informal words and phrases used in new or unusual ways that can be expressive, funny, or offensive. Cats are more suitable than dogs for urban life since dogs must be walked and can disturb neighbors, while cats walk themselves. Ebenezer Baptist Church is the center of the Martin Luther King Jr. National Historic Site, which millions visit each year to remember King's life and work promoting civil rights and nonviolence. Thunderstorms can cause extensive property damage, forest fires, and injuries from lightning each year in the United States.