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.
Visa Expiration Date is just the last date u can use the Visa to travel into the US. If your Visa expires on Dec 31 u can still travel on Dec 31 provided u will arrive in the US on the 31. The length of your stay is not on the Visa it is on the I-94. People do have expired Visa but their I-94 is still valid. A US Visa is just for u to travel to a US Point of Entry and apply for entry. The expiration date of the I-94 is the main thing.