Jaws are getting smaller because of changes in our diet and the way we prepare food.
When was the last time you heard a woman say "oh no, his jaw is far too manly. I prefer making babies with ladyboys."? Or did you just forget half the population are males?
Cloning a personality in the biochemical or neural sense is unlikely to ever be made feasible, if it's even possible.
But we should at least consider the possibility that at some point we may learn to duplicate personality and store it elsewhere, perhaps even imprint it later into a "blank" clone.
Much as I hate referring to the dumbed-down, often wrong, popular sci of the movies, 6th Day had some interesting ideas.
True, but natural selection can happen with or without outside influences.
And changing the environment simply changes the influences it has on us; so selective pressure is only shifted, not removed.
Not very.
The only thing that has really changed is that the range of factors affecting us has shifted.
For instance, on the whole we aren't advantaged by having highly developed predator-evasion adaptations, but on the other hand the less observant among us are more likely to be killed in avoidable "man-made" accidents (traffic accidents etc).
There are also far more discrete effects than in other species, such as highly complex, socially-mediated, peer-influenced courtship rituals and mate selection.
So is cloning still worthless?
(We can't safely clone humans yet, so if you assume we have acheived one technology for the purposes of this discussion, you may as well assume we have the other.)
Isn't it true that science constantly revises what we know?
100 year ago space travel was impossible.
The fact is that we don't have an anywhere near complete understanding of personality yet, so we can't predict accurately whether we will ever be able to store or duplicate it.
You'll need an awful lot of expensive equipment to turn nitrogen into a liquid form, and keep it that way. It would be dangerous and horribly impractical.
Hot jet chewing gum removers work fine. Liquid nitrogen is a bit... well, overkilly.
Time dude.
The window during which you observe the light will have an effect. You don't want to trace its path forever, so where you decide "that's enough of watching it zoom off in that direction" becomes an important consideration.
Or something.
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