"Which is more useful, the Sun or the Moon?" asks Kuzma Prutkov, the renowned Russian philosopher, and after some reflection he answers himself: "The Moon is the more useful, since it gives us its light during the night, when it is dark, whereas the Sun shines only in the daytime, when it is light anyway."

Quoted by George Gamow, The Birth and Death of the Sun, Chapter I (p. 1)