Blast forward at warp speed or loop back to change the past. Beware, though--the butterfly effect is a real risk!

Although they seem like scene-stealing sci-fi stories, they are based in actual ideas and thought-out theories. How close are we to flying through space or going back in time? Could we really change history or affect the future? Would there be downsides? The ethics of changing things should be explored, and every possible thread would need to be tied up. Could we even time travel responsibly, or would things just unravel? If only we could look into the future to be sure . . .