So, this is a wierd consequence of one interpritation of QM, namely many worlds.
The many-worlds interpritation of QM has a few interesting properties.
1> It is deterministic. You know exactly what will happen from a given situation.
2> There is no magic "quantum wave collapse".
3> It doesn't require hidden variables.
4> It is local: ie, you don't require faster-than-light communication between quantum hidden variables to explain waht is going on.
I believe it is the only
interpritation that deals with all of the above.
The other interesting thing about it is there is an experiment you can theoretically perform to verify for yourself if the many-worlds interpritation is correct or not.
You become Schrödinger's cat.
Put yourself in a box. Have a device that uses radioactive decay to generate a random number.
Every time you push a button, it uses the random number to decide if you will die. 50% chance you die, 50% chance you live, each time.
Press the button 1000 times.
Now, under non multi-world interpritations of QM, you will never hit the button 1000 times. The odds against you successfully doing this are so slim, they are basically zero.
Under the multi-world interpritation, one of you will walk out of that box, having hit the button 1000 times, the machine working perfectly, alive.
At which point, you will know that the many-worlds interpritation is true, beyond any reasonable doubt.
Anyone watching from outside the box will almost certainly not know it: they will see you enter the box, and die, basically 100% of the time.
Of course, if you are wrong, you end up dead.
If you generalize this thought experiment, what is going on in the box is no different than what is going on in the universe. Various events which boil down to QM events happen, and we grow old and die.
But, for every physical process, there is a miniscule chance that almost any result will happen. For instance, there is a miniscule chance that you will never grow old, because your body just won't age.
This chance is zero for almost all practical puposes. Except, of course, if many-worlds is true. If many-worlds is true, those chances will happen. There will be a universe where you never ever die. 1 billion years from now, you will be walking around without any medical aid.
It is a wierd thought.
Note that you won't be alive with anyone else: all your family and friends etc will die almost certainly.
Any thoughts?