"If experience is all I have, I may be alone—but the essential emotional necessity of the other demands that I live as if I am not," argues Dr. Moreira in this heart-felt essay. He embodies a long-overdue reemergence of existentialist thought in the 21st century and, as an active and successful AI scientist, in 21st century terms. We think both the worlds of philosophy and popular culture will be hearing a lot more from Dr. Moreira in the coming years...