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.
USCIS has discussed implementing a rule requiring permanent residents to replace green cards that lack expiration dates, but no such rule has been implemented to date. While more recent versions of the green card expire every ten years, valid green cards issued in the 1970âs and 1980âs may not have an expiration date. Older green cards with no expiration dates can create other problems for travelers.