Only In Spain 2 - Tomatina Food Fight

La Tomatina is an annual festival in Spain where thousands gather to throw tomatoes at each other, creating rivers of tomato sauce. The event, which involves dumping 130 tons of tomatoes, is the world's largest tomato fight. It began in the 1940s with a food fight among youngsters. The festival concludes with a massive cleanup.

How many people participated in the Tomatina, making it the world's largest tomato fight?

What is the historical origin of the Tomatina festival?