What an optimistic animal man is!" said Rumfoord rosily. "Imagine expecting the species to last for ten million more years - as though people were as well-developed as turtles!" He shrugged. "Well - who knows - maybe human beings will last that long, just on the basis of pure cussedness. What's your guess?
Kurt Vonnegut Jr., The Sirens of Titan
human, science-fiction, vonnegut