Your appendix is not, in fact, useless
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https://www.npr.org/sections/health-shots/2024/02/02/1228474984/appendix-function-appendicitis-gut-health?
https://www.npr.org/sections/health-shots/2024/02/02/1228474984/appendix-function-appendicitis-gut-health?
I'm pretty sure that my appendix is useless considering it was removed 20 years ago.