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I HAVE BEEN planning on writing this post for quite a while and hope to do the topic justice. The Cambrian explosion refers to the sudden radiation of metazoan life during the Cambrian period, and is usually placed between about 540-530 million years ago. It is often said that during the Cambrian explosion all of the modern phyla appeared. This statement has been seized upon by creationists who claim that the Cambrian explosion proves a sudden supernatural creation of life, rather than evolution of organisms over time.

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WHILE OUR species may be the most intelligent species on the planet at this point, our brains carry a lot of baggage from our evolutionary development that sometimes makes us irrational. This is not always a bad thing, but it requires that we be conscious of our weaknesses. We seem to be especially bad in understanding properly how the world works. Our intuitive understanding of physical processes is often wrong, and we can maintain this misunderstanding by failure to fully integrate observations that contradict it.1

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