What the Heck Are These 520-Million-Year-Old Blobs? Experts Can't Agree.

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?

via Live Science https://ift.tt/2GW6FWr