In keeping with #1, think about all the things you applied to your body today so that you do not smell like a human (think of all the products you used today to manipulate your smell). Toothpaste, mouthwash, shampoo, rinse, body wash, cologne/perfume, deodorant, hair gel, the fabric softener used on your clothing, gum/breath mints, hand lotion, and hand sanitizer are examples of such products.