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This adorable creature can regrow its brain — and other fun facts about axolotls you never knew

Here's everything you need to know about the Mexican axolotl salamander — from organ regeneration and conservation efforts, ...
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The mollusk hiding rare minerals in its teeth

Chitons are constantly scraping their teeth on rocks to eat the algae off of them, but that means their teeth need to be pretty tough. And it turns out one species's teeth are the hardest, stiffest ...