“For those concerned about the health implications of bisphenol-A (BPA), the focus has been on things like plastic water bottles, baby bottles or even lined aluminum water bottles. . . . Consumers would be wise, to be wary of receipts. Many of us carry them in our wallets, and come in contact with a myriad of them at tax time. For any individual who develops a health problem tied to bisphenol-A, it would be prudent to include a check of cash register receipts on hand, as a suspected source for contamination.”