Human evolution

The appendix actually still serves a purpose, although it has only recently been discovered what it actually do. As our ancestors ate bad food more often, and more often got food poisoning and various stomache diseases, the appendix works as a safe haven for bacteria to escape to. Once the infection has passed, it is easier for bacteria to recolonize the colon.

Nowadays we do not have a real use for it, though.
 
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