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Have you ever seen this animal? It is called horseshoe crab and is one of the oldest species, looking like an alien from the movies.

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But this crab is actually very important for us – something that became clear in the recent decades.

Medicine’s most noble work with one of the most expensive resources – horseshoe crab blue blood, is something you should definitely know about. Learn more here:

Source: NATURE | Crash: A Tale of Two Species | Blue Blood | PBS