@ Karlos
Yes it has been as you say 'experimentally demonstrated' but it's not the point I was trying to make. While science to me is my religion I still question a lot of it, even the proven stuff. The whole problem with science is it's limited by the human imagination.
Just because we can't yet prove to ourselves that lightspeed without "cheating" eg: the bending of space and time, cannot be exceeded and is therefore the fastest speed possible. I'm pretty certain that there is something yet to be discovered that would blow the socks off the speed of light.
Just as the topic of this thread turned out to be about these hithertoo unknown bacteria having only just been discovered, so are a lot more things yet to be discovered that neither you nor I or even the best scientific minds could even at this point in time begin to even have the slightest inkling of even coming up with. It's all a matter of time (hmm... time something we live our lives by and yet it's merely another human concept and only exists in our own little human minds, but that's a whole other subject...)