120 years ago we knew that some things can fly, because we saw birds. We just had to figure out how to do the same with humans. On the other hand, we have neve

120 years ago we knew that some things can fly, because we saw birds. We just had to figure out how to do the same with humans. On the other hand, we have never encountered anything in nature that goes faster than the speed of light. That's a pretty good hint that it's impossible to do so.