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The venom from the deathstalker scorpion is now thought to be a treatment for brain cancer. Photographed at the Natural History Museum of Los Angeles County on Wednesday, August 23, 2006. (Photo by Stephen Osman/Los Angeles Times via Getty Images)

There are few times when anyone is actually glad to come upon a scorpion. With loathsome pincers and painful venom, the creatures are widely regarded as terrifying and sometimes even deadly.

But in the case of the Deathstalker scorpion, its venom is proving to be quite useful—so useful that it's become the most expensive liquid on the planet.

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