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What the heck are these 520-million-year-old blobs? Experts can’t agree.

A new study says these blobs definitely aren’t brains.  (Liu J. et al./Proceedings of the Royal Society B) Here’s a brainteaser: Do the 520-million-year-old fossils of an ancient, bug-like creature actually show a silhouette of its brains? Or are these blobby shapes in its head merely fossilized bacteria? According to a new study, the fossilized structures in the Cambrian-period creature’s ...

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