Each of us has at least 100 new mutations in our DNA, according to research published in the journal Current Biology.Amongst other things, this means that "identical twins", those who were originally genetically identical before the embryonic clump of cells split into two individual foetuses, are unlikely to be completely genetically identical. In fact, it's likely that everyone has some cells of one genotype, and others of others, due to transcription errors during cell turnover.
Scientists have been trying to get an accurate estimate of the mutation rate for over 70 years.
However, only now has it been possible to get a reliable estimate, thanks to "next generation" technology for genetic sequencing.
Genetically, we are all unique. It's just that some of us have that uniqueness reflected more spectacularly than others.