If I have given a chance to create one thing I will create a Time machine. I know it sounds common but hey its life, I always regret everything I do. In  our school whenever I got low scores in tests, exams  i feel sad and the only thing I want is to replay or travel through time so I can make changes about it. Hahaha.
If i will be given a chance i want to make a machine that will convert nuclear waste to a fertilizer so that it can be useful and not a destructive ..