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Are you sure? I still plan for the human race to exist forever.
Hence the qualifier "probably". I also intend humans, and/or their descendants and mind children, to exist for as long as physically possible.
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The human biological form may one day become obsolete, but human consciousness can potentially exist forever through other media.
Got any ideas how we can survive the heat death of the universe?
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Invertebrates have a nervous system that is completely different from ours. Unlike vertebrates, many invertebrates probably do not feel pain, and have no real memory.
If I recall correctly, invertebrates have a much more distributed nervous system, which likely explains why they don't appear to go into shock when you remove a limb or two.
I'm reminded of this joke:
A scientist once trained a flea to jump whenever he rang a bell.
Using a microscope, he then anesthetized one of the fleas legs and rang the bell. The flea still jumped.
The scientist then anesthetized another leg and the flea still jumped when he rang the bell.
Eventually the scientist anesthetized more and more legs, each time ringing the bell, and each time recording that the flea still jumped.
Finally the flea had only one leg left. When the scientist anesthetized the last leg and rang the bell, he found to his surprise that the flea no longer jumped.
Then the scientist solemly declared his conclusion, based on irrefutable scientific data: Fleas hear through their legs...