Trace Fossil Experiments Put Pressure on Cambrian Explosion

Take a look at side-by-side photos in the middle of an article posted by NASA's Astrobiology Magazine. They look identical, but the ones on the left are fossils, and the ones on the right were made in the lab by shuffling around microbial mats. The title of the article suggests a setback for evolutionists: "First Signs of Animal Life on Earth May Be from Microbes."

To muffle the Cambrian explosion, scientists have searched for clues to the existence of complex animals in the Precambrian. The...