Cambrian Explosion

The so-called Cambrian Explosion - a critical juncture in the history of life on Earth when a dizzying array of animals first burst onto the scene half a billion years ago - may have been even more explosive than previously known.

The so-called Cambrian Explosion - a critical juncture in the history of life on Earth when a dizzying array of animals first burst onto the scene half a billion years ago - may have been even more explosive than previously known.