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Living to 120 is becoming an imaginable prospect
(www.economist.com)
This is a most excellent place for technology news and articles.
Immortality really just means that the odds of you dying by accident becomes 100%.
Not if I live in a geodesic dome sealed off from outside harms until the heat death of the universe, and hopefully by then we'll have warmed up the universe so I can continue with immortality
I'd say the probability approaches 1 but we can't know for sure that it actually reaches 1