The most advanced tech currently possible is probably nanotechnology that can interface in basic ways with the human mind...but it's operating on such a subtle level that it doesn't make for good comics.
Most comic tech is impossible, or so far off from our current knowledge that impossible still applies.
I remember reading some years ago that a "force field" had been built that uses plasma trapped in a magnetic field that could hold atmospheric pressure on one side and vacuum on the other. And yes, it did glow blue.
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This article covers both recent developments in electro-lasers, and the "plasma window" tech I referred to above.
The best thing in the article: The solution to a problem with using the plasma window in electron-beam welding was, I kid you not, "reverse the polarity." It doesn't get more comic tech than that.
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But comic tech is generally 5-10 centuries beyond it. Cutting edge technology is mostly in the fields of nanotechnology and being able to cognitively interface with mechanized systems....neither of which plays a role in comics because it's not as "fun".
The clunky (though interesting) attempts to recreate forcefields, invisible suits, complex laser constructions, etc. isn't even remotely close to something Reed/Doom/Bats/etc. would make in about 2 pages of off-panel tinkering.
I know we cant hope to match comic tech but i do think we are currently capable of creating some things we see in comics just not any of the crazy off the wall stuff
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I made a thread about the plausibility of Batman existing in the real world (it's floating around the Bats forum somewhere). So yeah, not everything is far-fetched.
i remeber in a simlair thread i posted the one where some crazy ass inventor in canada invented an iron man esque armor like 20 yrs ago to tackle grizzly bears and shit....also i wish i could live long enuff to see the day when we have tech that's simlar to that guy in ultimate FF who told Reed that he has "technology that can juggle worlds like brightly colored balls"