Need an idea?

Have you ever thought about why things are the way they are? Why can we only move forward in time, rather than backward? Why are humans dependent on other objects to fly? A number of questions of this sort could be asked. And, truth be told, these questions all have scientific answers. However, that doesn't mean we can't use our imaginations - we did so all the time when we were little. Can you imagine living in another world - a world completely backwards to ours? Now, this brings me to the actual topic of my assignment idea. How would you re-create the world? Would you keep everything virtually the same as it is now, with just a few differences, or would you totally re-vamp our way of life? Don't worry about the boundaries that earth puts on us, just use your imagination. Pretend like you're making a movie or writing a story in which anything is possible.