Best By/Sell By/Better If Used By/Expires On
Why do hermetically sealed things expire?I was opening a bottle of aspirin the other day. After I peeled back the plastic seal around the lid, I had to get a jar opener to unscrew the cap. Once I had done that, I had to get a knife, to scrape off the glued-on inner seal. Only then, was I able to use a pair of tweezers to remove the inner packing cotton. During all that process, I glanced at the expiration date on the package, and began asking myself about it. Th...