The kitchen is where we spend so much of our family time together, with meals, homework, etc. Would you believe that the kitchen is the dirtiest room in our home?  This is true according to Phillip Tierno, PhD, director of clinical microbiology and diagnostic immunology at the New York University Langone Medical Center and author of The Secret Life of Germs. “That’s because we deal with dead animal carcasses on our countertops and in the sink.” He goes on to say that the kitchen sponge is “the single dirtiest thing in your kitchen, along with a dishrag.”