This question was first mentioned in the book of Douglas Adams' Hitchhiker's Guide to the galaxy. " "The answer to the Ultimate Question of Life, the Universe and Everything» (what is the answer to life, the universe, and everything) was supposed to solve all the problems of the universe. This eagerly awaited answer all reasonable race.
He was received as a result of seven and a half million years of continuous computing on a specially created computer Deep Thought. According to the computer, the answer was several times checked for accuracy, but it can all upset. It turned out that the answer to the question - "42". In a figurative sense - a response that does nothing. Or gives, but in the sense of parody. Later, the number 42 has been used many times in various works as a symbol of the meaninglessness of such philosophical questions.
Google, known for his love of jokes and "Easter eggs" also knows the answer to this question. If you type in the search box query «what is the answer to life, the universe, and everything», you get the result, calculated by Google on a calculator! The answer you already know :)