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.
On how much to tip your Uber driver Well the standard tip for a taxi is 15 to 20 percent. And that is my initial reaction: I would say tip 15 to 20 percent of the fare. But things get really dicey with Uber because they have dynamic pricing. What might be a $40 ride to the airport at three in the afternoon could be a $150 ride at peak time. Do you tip 20 percent on $150?