John and his father go out to look at the stars. John sees two blue stars and a red star. His father sees a green star, a violet star, and two yellow stars. What is the total temperature of the stars seen by John and his father?
Surely You're Joking, Mr. Feynman!: Adventures of a Curious Character, Judging Books by Their Covers (p. 293), W.W. Norton & Company, Inc. 1985