Is there any real potential advantage to having two hearts?

One common way sci-fi writers try to make their aliens seem more 'alien' is to give them an extra heart.

This has been done for example in Babylon 5, Dr. Who and Alien Nation among others.

But: Would a humanoid (note: in this question humanoid only means two legs, two arms, one head, all in ascending order) really have any obvious benefits from this biology? Is there a way two hearts could actually be detrimental?

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Is there any real potential advantage to having two hearts?

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