There is a book (theory) called 'Genetic Mirror Theory and other Natuarlly Occuring Phenomenon,' by Marsille Roussau. Someone posted online this:
I recently found an interesting natuarlly occuring thoery found in our world that states everyone has a mirror image somewhere in the world. You may have heard of this. Its called Roussau's genetic mirror theory, and I must say it is very interesting. Roussau's genetic mirror theory says that everyone in the world has an exact twin somewhere, however according to the theory you never encounter this person, by laws of probablitly and other natuaral occuring phemnomen. Its the theory that was devised by a French Mathematician named Marseille Roussau in the year 1988. He used