Evolution Tells Us We Might Be the Only Intelligent Life in the Universe

Are we alone in the universe? It comes down to whether intelligence is a probable outcome of natural selection, or an improbable fluke. By definition, probable events occur frequently, improbable events occur rarely--or once. Our evolutionary history shows that many key adaptations--not just intelligence, but complex animals, complex cells, photosynthesis, and life itself--were unique, one-off […]