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" ... Just over half-a-billion years ago, the Cambrian explosion occurred, giving rise to a wide variety of megafaunal animals whose descendants have persisted on our world ever since. During all that time, only human beings, which evolved just a few hundred thousand years ago, became a technologically advanced civilization. In the 20th century, we finally reached space, and now have the capacity to begin reaching for the stars. But are human beings the Earth’s best chance to become a spacefaring planet? Or will another civilization after we’re gone be better equipped for that challenge? Although we frequently assume we’re Earth’s best (and only) opportunity, that assumption may be incorrect. Here’s why. ... "