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Scientists trace human vision back to ancient one-eyed ancestor living 600 million years ago

Scientists trace human vision back to ancient one-eyed ancestor living 600 million years ago

New research suggests that humans and all other vertebrates may share a surprisingly strange evolutionary ancestor-an ancient, worm-like creature that lived around 600 million years ago and may have had a single eye positioned on the top of its head. Scientists say this “median eye” not only shaped the early evolution of vertebrate vision but may also still exist today in a transformed form as the pineal gland deep within the human brain.