What does the "R" stand for in the MMR vaccine?

Who wrote the 1881 novel "The Portrait of a Lady," about American heiress Isabel Archer? The Preamble says the U.S. Constitution was established in order to form a more perfect what? The Snurfer, a forerunner of the snowboard invented in 1965, got its name by combining which two words? The Bible describes the promised land of Canaan as flowing with which two things? The Florence & Cripple Creek Railroad, represented at its state's railroad museum, served a famous gold district in whi… Which queen reigned in Castile from 1474 until her death in 1504 and sponsored Columbus's first voyage? The Rhodope Mountains and the city of Sofia are in which country? What is the term for a government's power to take private property for public use, with fair compensation?