What similarities do doppelgangers share beyond physical appearance?

According to research, doppelgangers share not only physical similarities but also genetic traits that influence various aspects of their lives. The study found that lookalikes were more likely to have similar levels of education, height, weight, and even smoking history. Researchers confirmed these individuals were not closely related, with only one pair possibly sharing a common ancestor from several hundred years ago. The researchers believe these genetic similarities occur by random chance. As Estella explained, with so many people on the planet, genetic combinations are 'no longer infinite' and the system repeats itself. This suggests that while nature strongly influences human resemblance, environmental factors ('nurture') also play a role in fine-tuning genetic expression.