This week, we're looking at how food -- and the containers it comes in -- have changed over time, and some of the factors that have influenced these changes. We'll speak with Anastacia Marx de Salcedo about her new book "Combat-Ready Kitchen: How the U.S. Military Shapes The Way You Eat" about the ways military needs have influenced the food we all eat. And we'll speak with statistician Patrick McKnight about the BPA controversy, and how statistics can be used and misused in scientific studies.