True, however a key distinction i'm making here is knowing something exists and knowing how it works and being able to replicate that in another system could be

True, however a key distinction i'm making here is knowing something exists and knowing how it works and being able to replicate that in another system could be just as much of an infinite timesink. I'd rephrase the "nothing currently exists that even proves it is possible" to, nothing has been observed to demonstrate its possibility. That and things like warping space could throw a wrench into the "we can't travel faster than light". But maybe we can end run around it. Though the same can be said of the brain, we really know we don't know a lot more than what we don't know about physics.