Experiments in television broadcasting began in the 1920s in the US and Europe. By the 1930s, NBC and BBC had established TV stations that offered regular programming. However, development was slowed by World War II. Television is well-suited as an educational medium since it is visual and can demonstrate objects and processes. It also shares capabilities with other media like motion pictures, radio, and recordings. TV can educate children effectively when they watch educational programs with interest, though it also provides inactive entertainment that some argue negatively impacts young viewers.