Find Out Why This Beetle Doesn't Explode

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The Bombardier Beetle creates an internal explosion to propel hot, poisonous chemicals at its enemies.  Scientists studying the beetle have shown how it works in an x-ray video of the process. 

Watch How This Tentacled Caterpillar Reacts to Sound

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This Peruvian caterpillar reacts to loud noises with the tentacles on its back. 

The School Nurse's Bane: Head Lice

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Here's what you might not know about these banes of childhood: Though other species of lice infest other mammals and even birds, Pediculus humanus capitis lives on the human scalp and nowhere else. A louse spends the first week or so of its life as an egg, or nit, before hatching into a nymph. Over the course of about seven days, the nymph will molt three times, growing bigger each time, until it reaches the adult stage.