"From a noted Cambridge zoologist, a wildly fun and scientifically sound exploration of what alien life must be like, using universal laws that govern life on Earth and in space. Scientists are confident that life exists elsewhere in the universe. Yet rather than taking a realistic approach to what aliens might be like, we imagine that life on other planets is the stuff of science fiction. The time has come to abandon our fantasies of space invaders...

"This is an in-depth study of the theory that Mars was once a world which teemed with life. Perhaps, even, life not at all too dissimilar to ours. Incredibly . . . the Martians may still be there. Alive. This book explores the CIA's top-secret search for the Martians, multiple photos of strange anomalies, and the latest revelations about the environment and water on Mars. The questions concerning life on Mars-then and now-are many. The answers are...