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These scales are being used to design armor and even airplanes. They come from pirorucu or arapaima fish, which are mostly found in the Amazon river, which is one of the toughest environments on earth till today. But after millions of years, they've evolved to survive even the most dangerous predators, and that's all because of their scales, which are so strong that even piranhas with razor-sharp teeth can't even pierce, and they're even rumoured to be bulletproof, which is why people need to use special tools just to get the scales out.
But what's strange is they're not only really tough, but they're highly flexible too, which is why scientists are studying them to develop new materials as

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