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What is the most amazing technological or science concept you ever saw in sci-fi?

Nanomeds capable of making everyone immortal, or transdimensional engineering to enable us to handle the resultant population explosion.
 
Don't know if this qualifies.. but the whole dream sharing thing in Inception. However, how DOES it work? Does the architect save her maze on a disk (it's established she doesn't need to share in the dream) .. also the suitcases don't seem to HAVE the dream.. it just seems a way to share the chemical (both quantity and a simultaneous delivery into the veins)... but it's not actually the dream sharing device.

Nolan skimps on explaining how this all works

It's basically a MacGuffin.

It's just not important how the dream sharing works. It only matters that it does, not how.

Besides, trying to actually explain the details of the process would just slow the film down and bore the viewers.
 
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The Star Trek movie where they Save the Whales.
How Dr. McCoy waves the cigarette lighter thing over the woman in the hospital hallway and cures her of whichever disease she had.(diabetes or cancer)
 
The Star Trek movie where they Save the Whales.
How Dr. McCoy waves the cigarette lighter thing over the woman in the hospital hallway and cures her of whichever disease she had.(diabetes or cancer)

Missing a kidney. He gave her a pill.
 
It's basically a MacGuffin.

It's just not important how the dream sharing works. It only matters that it does, not how.

Besides, trying to actually explain the details of the process would just slow the film down and bore the viewers.
I disagree. Sure you don't want to bog down in the explanations. Also since it's fictional, you can't get too detailed. But to increase the verisimilitude, the creators have to be able to have at least some basic answers at the ready , especially since the questions I asked are very close to have a need to answer to understand the plot

MacGuffin's, on the other hand, are a different thing entirely,.. and most of THOSE have explanations that help verisimilitude
 
I've seen Inception twice, and I never once even thought about getting an explanation for how the dream sharing work. It wasn't really a technical movie, we got all we needed to get to be able to follow the story.
 
Passengers
It wasn't any specific technology, because it all had been mostly shown before, but the total presentation. Everything looked gorgeous!
Of course there are major plot holes:
  • Not being able to put passengers/crew back into hibernation
  • Ship system failure not waking crew
  • Bringing passengers out of hibernation a couple of months before arrival at destination. But needed that MacGuffin to explain the fancy ship and all the amenities.
 
technological -- Larry Niven's Ringworld. A structure as big as Earth's orbit, a million miles wide, with mountains a thousand miles high on either side to keep the atmosphere in. Surface area of a million Earths. Spin it to simulate gravity. Sculpt the surface with whatever features you want. Incredible. (Though it requires incredibly strong materials to make it.)

scientific -- My mind was blown by the concept that Jupiter's core might be an enormous diamond (though it's probably not). Presented in Arthur C. Clarke's 2061.
 
The universal/near instantaneous decryption device in Sneakers. Yes, I do consider this film to be SF. Sue me.
 

Note to all: Do not, under any circumstances, go looking for Stallone's explanation about the seashells.

Just. Don't.

(me, I think that they simply generate a sonic field that cleans you out. Kind of like Trek's sonic showers.)
 
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Amazing - the TARDIS on Doctor Who when I was a young child.
Disturbing - the Cybermen, also on Doctor Who, scared the bejesus out of me. The Borg are pussies in comparison. However, like the Borg, over time and especially recently, the Cybermen became a bit crap.
Also, almost anything Vernor Vinge comes up with.
 
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