According to science, its virtually impossible to meet someone who looks completely identical to you, therefore, doppelgangers should not exist.
In fact, there are so many genetic and facial variables, nobody has even bothered to work out the measure of probability.
However, thats not to suggest theres a shortage of unwitting lookalikes, and surprisingly, it seems like theres a disproportionate number of them in Russia.
1. Scarlett Johansson and a Russian woman drinking large quantities of cider