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Our bodies are such a marvelous machine, with many individual parts and signaling processes, with the ability to rebuild and adapt.

Something that has always blown my mind is that you can have a hemisphere of your brain removed with no major consequences:

> Studies have found no significant long-term effects on memory, personality, or humor, and minimal changes in cognitive function overall.

Had that not been the case, we'd be a dead branch of evolution probably long gone by now.