yeap agreed with the last statement.. im kinda pissed with the "green earth" campaign. they are clearly doing it for money. now, lets not look at earth. imagine earth is a person, a human. when he has flu, fever, nobody give a damn. the it worsen to high fever, still no one care. now its cancer last stage, only ppl start to care for him. isnt it a little too late? u might as well enjoy the last moment of earth before its all over

now, back to the main topic. if a mad scientist (MS) manage to create a robot as u said, without proper AI, he wont be able to kill effectively. for example, the robot is in point A and his target is in point B. without excellent AI, he will proceed from A to B in a straight line method (i believe MS programmed it to use the fastest way to kill his target) this makes it very vulnerable and easily destroyed.

lets look at terminator. why is it so hard to kill? because its intelligent? hardly so. they just rush to their target. the main problem with terminator is its "indestructible body". lets not look at mercury man, thats a bit too far in the future for us to worry about. lets look at arnold robot. normal rifle couldnt stop it, nor can a shotgun. heck, even when its head is plummeted (in terminator 2) by whatever that thing is, it still manage to reboot. this means that its core (CPU) is still undamaged. for those who watch terminator 2, u know that the mercury man aint gentle with arnold. that is no light punishment.

now, lets get back to real world. where on earth are we going to find such hard material? not to mention that I did not saw arnold recharging himself even once. so it means that it is capable of recharging itself. question here is how? solar panel? radio wave? highly unlikely.

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Added on May 21, 2010, 4:14 am

given an infinite amount of time, with the assumption that humans race are not wiped out before it happens, there is a 99.999999999999999% it will happen.

IMHO, i think u view us humans a little too highly. we are not that great of a creature.
are we the smartest? no
are we the fastest? no
are we the strongest? no
are we the one with the sharpest eyesight? hearing? smell? touch? taste? no
are our communication the best? no

so why are we the top of the food chain? simple. we are just plain jack-of-all-trade

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Added on May 21, 2010, 4:19 am

unfortunately, the world biggest problem is human

why is our ozone layer almost gone? human
why is there war? human
why is the nature being polluted? human
why is the natural resources being drained like its nobody business? human
why is the world climate changes so drastically? human
...
...
...
in short, the root of all problem is humans. therefore, only be eliminating us can the AI truly solved this world problems. i might sound pessimist but thats the truth