A bizarre, cyclops-like creature from nearly 600 million years ago may hold the key to how your eyes—and even your sleep cycle—evolved. Scientists have discovered that all vertebrates, including humans, trace their vision back to a single light-sensitive “med…
Humans share a surprisingly strange ancestor with all other vertebrates. New research suggests that far back in evolutionary history, one of our earliest relatives had a single eye, much like a tiny … [+3583 chars]