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.
Tipping Guide. The customary tipping rate is 15%-20% for taxi drivers and waiters; bellhops are usually given $2 per bag in luxury hotels, $1 per bag elsewhere. Hotel maids should be tipped $2 per day of your stay. A doorman who hails or helps you into a cab can be tipped $1-$2.