Definition. 1  Lactose intolerance refers to the inability of the body to digest lactose. 2  Lactose is the form of sugar present in milk. The enzyme lactase, which is normally produced by cells lining the small intestine, breaks down lactose into substances that can be absorbed into the bloodstream.
1 Tipping upon drop-off of your car is totally optional and is not done by the majority of drivers. Tip your valet when your car is returned to you from the parking lot.  A tip of $1 to $5 is the typical range, with $2-3 being most common.
How much should you tip? Valet service may be free, but tipping is a must. William Werner, a professor at UNLVâs William F. Harrah College of Hotel Administration who researches tipping, says the average tip for a Las Vegas valet is $2. A $5 tip is nice but not expected. Because most valets pool their tips, itâs appropriate to tip attendants on the way out but not necessary when dropping a vehicle off.