^^ I assume, or at least hope, that you guys are using watching TV as some sort of metaphor, but I for one like to think that if I were to stumble upon immortality I would have the time to develop myself to occupy my eternity with something more than TV shows!
That said, you make a good point, TimeDragon, in that an immortal being would likely develop a memory system which discards old memories to make room for new ones -- especially if immortality doesn't include an upgrade in brain capacity.
Since our identities are based so heavily on our memories, an immortal being would, in a sense, become a new person each time a complete set of old memories are replaced with new ones... making only the body, and not the individual, immortal. I suppose the immortal could lessen the impact of these memory exchanges by holding on to some old memories, but even these would eventual become little more than dusty curios of events otherwise forgotten.
So maybe physical immortality is limited to just the length of time that your brain can retain its original complement of memories. I'm guessing that would still be many centuries, though, so I'd still be game... oh, and I have a feeling I'd never be bored; the number of things to do in this universe is likely infinite.
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