I would free the world from all negative emotion. That would then only leave happiness, peace of mind, and joyfulness. What could be better than that?
Automatic censorship for expletives. So, if you shout an expletive, you actually come out with something like "fluffy ducks" or the like.............
If i will be given a chance to go back in time and fix something i will definitely go back to that day when my mom had an attacked. I have this regret that if only i paid enough attention to her i could have brought her to the hospital for check up now she is gone.
That's an interesting question. My first response is to reply that I would change me. But the question says "if you could", which indicates that the 1 thing is not something I currently can change. Well, I can change me (to a certain extent anyway) already. So my next response is I would change the ability of humans to see with spiritual eyes, not just physical ones.