" I would like to speculate a little on the development of life in the universe, and in particular on the development of intelligent life. I shall take this to include the human race, even though much of its behaviour throughout history has been pretty stupid and not calculated to aid the survival of the species. Two questions I shall discuss are “What is the probability of life existing elsewhere in the universe?” and “How may life develop in the future? "

― Stephen Hawking , Brief Answers to the Big Questions