🫀 A walnut-sized clam grows its own fiber-optic cables - and it has been doing it for millions of years.
The heart cockle (Corculum cardissa) has a shell packed with microscopic transparent windows made of aragonite crystals arranged like fiber-optic tubes. They pipe sunlight directly into the clam's tissue, where symbiotic algae photosynthesize and produce food for the animal.
Even wilder: the crystal structure acts as a selective filter, letting beneficial wavelengths through while blocking most damaging UV radiation. It's a built-in sunscreen and light pipe in one, achieved entirely through mineral geometry.
A 2024 Nature Communications study showed the shell transmits more than twice as much useful light as harmful UV. Nature converged on fiber optics long before we did.
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