Listener Sommer calls in to ask why she can buy foods in her grocery store that other countries have banned. Trying to figure out what all the chemicals and dyes in her food might do to her has left her with one question: “Don’t you care about us?” This week on Explain It to Me, host Jonquilyn Hill gets some answers (and a scary story about orange dye!) from Vox producer Kimberly Mas and the…