Every food pantry welcomes donations of peanut butter because it is so nutritious, and every mother has it in her kitchen because no matter what else the kids refuse to eat, they will almost always accept a pb&j sandwich. Peanuts were the answer to Andre Briend, a French pediatrician, who was trying to find a way to treat malnutrition. He knew about F100, a fortified dry milk that could counter the biochemical effects of nutrition in children. But…