Perhaps if you did know something about this you'd understand why this is an annoying sort of comment. Nothing personal, this kind of thing happens a lot.
General public: Hey scientists, is it possible to communicate faster than the speed of light?
Scientists: Gee, I dunno, let's go figure that out.
[many years of hard work]
Scientists: Whew, well we've gone away and done a lot of hard work and it turns out that it's impossible. Here's a twenty-page pamphlet with a few equations which summarises the most relevant points.
General public: Hummmph, well, I haven't bothered to read that pamphlet, but I can't help but think you're being closed-minded and that in fact it might be possible but you're just too dumb to figure it out. [goes back to watching Star Trek]
The most annoying thing about this line of argument is that it's impossible for the voice of conventional wisdom to actually win it. We can't prove that faster than light travel is impossible, nor that there isn't a dragon hiding in your garage (carefully hiding from every observation), nor the nonexistence of ghosts or body thetans.
If you want to start an argument with Every Physicist In The World about whether it's possible to send information faster than the speed of light, it's nice if you familiarize yourself with the arguments as to why it's impossible first. I think you might agree that it's less like the Wright Brothers and more like King Cnut.
If I understand it correctly, it's theoretically feasible to achieve the the latter (in effect).
While it's impossible to send information at speeds that exceed c, it should be possible to bend the spacetime (e.g. using worm holes) so that the information would appear to have traveled faster than light.
Wormholes, it should be noted, are "possible" in only a rather remote sense. If you put a wormhole into the equations of general relativity and say "Hey general relativity, is this a valid solution to your equations" it'll say "Uhhh, sure!". But then if you ask it how to arrange masses in order to actually get that solution it'll say "Haha, you can't do that."
Does the "you can't do that" refer to getting a how-to-build-a-wormhole recipe from general relativity, i.e. "I can't tell you how to build one, go figure it out yourself".
Or is it more along the ways of "You don't have a worm hole? Well too bad, there's no way you can create one. But hey, it could totally hypothetically exist."
If it's 1) then we could possibly build one (or find it in the universe somewhere) and GR just doesn't tell us how. If it's 2) then we know it can't even be created.
On the other hand, we still don't understand the whole relativity/quantum-mechanics overlap region, so it's possible that whatever new physics are waiting for us in that regime just might include wormholes.
I'm really reluctant to say that, though. Many people seem to jump straight from that to drawing pictures of wormhole-hopping spaceships. Sorry, it's very very very very very very very unlikely to happen.
I've never been able to figure out in my (broken, I'm sure) mental model how you could create a wormhole but I suspected that the people who actually understood physics did know.
Thanks a lot, man. Interesting stuff.
The Wright brothers didn't have to overturn any accepted theoretical constructs to build the airplane. On the contrary, the theory at the time said they were on the right track. It was the general public that thought it was impossible.