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.
Walt Disney World Resort continues to honor all unexpired theme park tickets with remaining admission days. However, be aware that unless you purchased the No Expiration Option, theme park tickets purchased after 2004 expire 14 days after their first use. While the No Expiration Option is no longer available, if you have previously purchased theme park tickets with the No Expiration Option, your tickets will still be honored.