What was the very first Breakfast Cereal?

Who invented breakfast Cereal? How did Cereal become such a popular breakfast food? Why do you add milk to cereal? To take our SmartyQuiz sign up for our Free Newsletter at www.WhoSmarted.com See Privacy Policy at https://art19.com/privacy and California Privacy Notice at https://art19.com/privacy#do-not-sell-my-info .