“Physics could teach everything about the universe except why. That led to what he calls his adolescent existential crisis. “I began trying to figure out what the meaning of life and the universe was,” he says. “And I got real depressed about it, like maybe life may have no meaning.”

“Physics could teach everything about the universe except why. That led to what he calls his adolescent existential crisis. “I began trying to figure out what the meaning of life and the universe was,” he says. “And I got real depressed about it, like maybe life may have no meaning.”

— Walter Isaacson