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.
1 Get your hair cut at a salon? Tipping 15%-20% of the haircut cost is good, and maybe a little more around the holidays.  If I ever have to valet my car, I usually tip $2 to the valet driver when he or she brings my car back around.