All the elements in your body were forged many, many millions of years ago, in the heart of a far away star that exploded and died. That explosion scattered those elements across the desolations of deep space. After so, so many millions of years, these elements came together to form new stars and new plants. And on and on it went. The elements came together and burst apart, forming shoes and ships and sealing-wax and cabbages and kings. Until eventually, they came together to make you. You’re unique in the universe. There is only one "you". And there will never be another.