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This crab’s blood may have saved your life

No other animal on Earth is like the horseshoe crab. Considered a living fossil, the horseshoe crab has survived countless mass extinctions unscathed, and appears much as it did when it first appeared nearly half a billion years ago. It also has eerie blue blood that, surprisingly, has essential uses in the medical field. Could this ancient creature have saved your life at some point?

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