Is There a Difference Between Identical Twins and Doppelgangers?

The study looked into how people matched up with their microbiome, epigenetically. They found that they did share a lot of what are called S&P, single nucleotide polymorphisms. It's basically nature versus nurture or more to the point, it's like nature and nurture working together to make us slightly different even when we're bound to look same genetically.