In the Origin of Species, Charles Darwin documented a fascinating and troubling discovery.

He found that fossil layers during the Cambrian period, dating to some 530 million years ago, contained plants and animals of incredible diversity but no evidence of these life-forms’ ancestors in the rock layers below.

The problem persists today as scientists have yet to find fossil evidence of ancestors to the Cambrian animals.

The event during this remote geological era has come to be known as the “Cambrian Explosion.”

Learn more about the fossils found and other shocking details the textbooks leave out. Read Darwin’s Doubt.
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