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The appendix, which is located in between the small and large intestines, serves absolutely zero function in the digestive process. Some scientists think that it might have served a function when human diet revolved largely around plants.

Now, many people simply have it removed because it can become infected and rupture.

The Third Eyelid

If you look closely at your eyes, you can see an extra bit of skin lying close to your nose. This skin, dubbed the ‘plica semilunaris,’ serves virtually no purpose for humans anymore.

However, birds and reptiles have a similar third eyelid that is translucent and is pulled over the eye for extra protection or moisture.