Though seemingly ordinary, we have found great use of these animals (yes, sponges are animals). Glass sponges are a family of sponges with incredible structure. As you can see, they look no different than complex crystals. But they're ALIVE. The last two pictures are to show you more details of the structure, but the really cool thing about these things are that they teach us about fiber optics. They are fantastic at sending fast electrical impulses from one end to the other (spreading information) and there are plenty of scientists trying to learn how exactly they do this so we can incorporate it into our own technology arsenal of information sharing.
Oh, and they can live up to 15,000 years (the longest of any living creature).
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