This energetic video shows what the Cambrian Explosion is and when it occurred in relation to a 24 hour clock that represents Earth's life. The Cambrian Explosion was a huge increase in multicellular life forms that occurred about 542 million years ago. The video then demonstrates how the Cambrian Explosion was only a small part of the history of life on Earth. It goes through the major developments of life on Earth and shows how it relates to a 24 hour period. This video is a tool in understanding the Cambrian Explosion and theory of evolution.