Does a horse lift its legs off the ground when running?

You will not leave the ground when you run. Before there were movies, two Americans made a bet on this matter. Then we invited a famous photographer to take pictures of the whole process of the horse running. Then the photographer set up more than twenty cameras in twenty different directions. The photos taken show that when the horse is running, there is always one leg on the ground. When the photographer connected the photos one by one, he discovered that the horse was running. So a movie was born. What an interesting history of film development.