Hand washing. Hand washing, also spelled handwashing and known as hand hygiene, is the act of cleaning one's hands for the purpose of removing soil, dirt, and microorganisms. This may be done with or without the use of water, other liquids, or soap.
Sunscreen does expire. The molecules in suntan lotion (such as homosalate and octyl salicylate) block the penetration of UV radiation by acting as filters and absorbing and reflecting high energy UV. Over time these molecules break down and lose effectiveness, kind of like expired cold medicine or vitamins.
Cookie Expiration. Every time a hit is sent to Google Analytics, the cookie expiration time is updated to be the current time plus the value of the cookieExpires field. This means that if you use the default cookieExpires time of two years, and a user visits your site every month, their cookie will never expire.