Vestigial Organs Not So Useless After All, Studies Find

Appendix, tonsils, various redundant veins—they're all vestigial body parts once considered expendable, if not downright useless.

But as technology has advanced, researchers have found that, more often than not, some of these "junk parts" are actually hard at work.

Case in point: the spleen, which a new study shows may be critical in healing damaged hearts.

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Via: National Geographic News