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Primitive Sea Mollusc Has Eyes of Rock

That's a tiny sea mollusk called a chiton, that lives about 50 feet below the water's surface. It's a pretty darned weird animal, but scientists have found something that makes it even more remarkable: it has eyes made of rocks.

"Turns out they can see objects, though probably not well," said study researcher Daniel Speiser, who recently became a postdoctoral fellow at the University of California, Santa Barbara. [...]

The team realized in a lab experiment that the animal's lenses were made of aragonite (calcium carbonate), rather than proteins like other biological lenses.

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