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Immortality is impossible.
The reason is because no one can say with 100% certainty that we are not going to die tomorrow. The notion that we are effectively immortal is false.
Of course no one can also say that there will never be an 100% certainty of immortality.
So how do we approach this problem and how do we measure immortality? With great difficulty.....
You have to measure the probability of death in a certain time frame (for simplicity I'll say the probability of dying on any given day). There are many factors to consider when measuring the probability of death:
*There are many ways to die. Each of these ways has to be objectively measured to find out the probability of them occuring at any given time. For example; in if you were living in Queensland (depending on how long you were there) in the year 1999-2000 your chance of being murdered was 211/the population of Qld, ceteis perebis. However since murder rates don't tend to fluctuate much you could get a fairly good trend result and give a fairly accurate figrue of your probability of getting murdered on any given day in the state of Qld. Although to be more accurate you would need to find specific murder rates in specific geographical locations within QLD. Of course there are other modes of death but this is just one example.
*Location plays an important factor of course, given for example that infant mortality rates are higher in Tunisia then Britain. Or your probability of being killed by a Polar Bear is higher in Antarctica then in Paris.
*Technology has to be factored in, as it is arguably safe to say that the probability of living to 80 is much higher now than in 1800 obviously due to medical advances.
*Externalities - such as the chance that we'll get hit by an asteroid, wiped out by aliens or other factors that are difficult to measure.
*Individual characteristics (such as whether you're risk averse, risk accepting or risk neutral); cognitive machines could be useful here: http://www.businessw..._4912_tc121.htm
Can anyone think of any more?
Since you cannot measure probabilities with the greatest accuracy you have to allow for margin of error. However as our knowledge increases we may be able to reduce this margin of error as much as possible.
The point of all this? Statisticians can measure progress by how much we have reduced the probability of death so that it it gets as close as it can to ZERO. Whether we ever reach ZERO is uncertain.
One argument against immortality is that the more you live, the greater the probability of having an accident or something. The probability of death gets larger. Yet of course death rates in all categories are bound to change. So this is close to irrelevant. Past probabilities won't matter as future probabilities get closer and closer to zero, thus in 20 years we will be living with far greater certainty in the present and the expected future from that point (20 years from now).
When we have super-intelligent AI they could give us even better results and this progress indicator could be our evidence of where we are at on the immortality scale. I think it is relatively safe to say that the graph will show an upward trend. [B)]














