Today is National Peanut Butter Lovers Day -- a time to celebrate one of America's most popular foods. It's not to be confused with National Peanut Butter and Jelly Day, which is April 2nd, or National Peanut Day, which is September 13th. Did you know that peanut butter is found in about 75 percent of homes? Whether it's kids taking PB-and-Js to school, or college students eating it out of the jar with a spoon, it's about as American as apple pie and hamburgers.