I doubt that we could ever fly. Too many complications. For one, we'd have to be flapping our wings just like the birds, and people aren't birds.
i said i doubt it not that im sure it is impossible. there are lots of things that can manipulate time gravity for one though what happens when you start manipulating the time line. If it were possible i would be the first to go and start a new nation and whit modern knowlage of tech stop all the bloodshed that was done in the name of religions, and stop all the polution problems before they began. Though what would then happen whit this time line would it change would i never be borne and never go back in to the past would i stat a diferent time line in its own universe seperate from our own if so what is then the point if there are infinite universes whit infinite timelines one like that should alredy exsist.