Many of us are avoiding the chemical BPA -- or bisphenol A -- which has been linked to heart disease and liver problems. The most common source of BPA is (and was) found in plastics like reusable water bottles and food storage containers. The good news? Many manufacturers have eliminated BPA from their products, and buying BPA-free containers is pretty easy. But did you know thermal receipts, like the kind you get at the supermarket or the gas station, have BPA in them? It's needed to create an impression in the paper so ink isn't needed. Whenever possible, opt for an email receipt, which is paper-free. But if you need a receipt, be cautious not to put the receipt in your mouth, and always wash your hands after you handle a thermal receipt.