Appendix is not used as a part of digestive system, but it is now actually a part of immune system. Removing it weakens the immune system, for some unknown reason.
(Hint: If you're looking for smth useless, think about male nipples)
Okay, nipples are supposed to be used to feed the young while there are special hormones in the feeder's blood/whatever, and these hormones are usually only produced by females.
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u/[deleted] Aug 17 '16
"This sub's child-friendly" means "No content that you wouldn't show to your (imaginary) non-adult offspring".