Tweet by ProfAbelMendez

Oldest Nervous System Found in 520-Million-Year-Old Fossil https://t.co/5WxBQKrlq7 pic.twitter.com/O5PEXX6CEm

— Prof. Abel Méndez (@ProfAbelMendez) March 2, 2016

via https://twitter.com/ProfAbelMendez

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