The Fascinating World of Doppelgangers: From Superstition to Science

TLDR Doppelgangers, or look-alike humans, have been a subject of fascination for centuries. From superstitions about impending death to scientific studies on genetics and facial recognition, the concept of doppelgangers raises intriguing questions about human uniqueness and the role of DNA in appearance and behavior.

Timestamped Summary

00:00 A photographer has been assembling pictures of doppelgangers for 20 years, bringing them together in his studio and creating a sense of intimacy between them.
04:57 The term "doppelganger" was coined by Jean-Paul in the 18th century, but he actually used the word "doppeltganger" with a T to refer to a look-alike human, and it eventually became the word we use now for a non-related look-alike; there is a long-standing superstition that if you see your doppelganger three times, it means you are about to die.
09:53 TV shows often depict doppelgangers for comedic effect, but there have been historical figures who claim to have seen their own doppelgangers, such as Abraham Lincoln and Percy Bysshelly.
14:51 There is a project called "I'm Not a Look-A-Like" where a photographer takes pictures of people who look like identical twins, and this raises questions about the limited number of facial combinations and the role of DNA in doppelgangers.
20:01 A study found that doppelgangers, who are genetically unrelated, share similar genes that contribute to their facial traits and builds, but differences in their epigenome and microbiome account for variations in their appearance and behavior.
24:53 There is a possibility that someday we could understand exactly what makes a person unique, but there is no agreed upon definition of what constitutes a doppelganger.
29:50 Our brains use shortcuts when looking at people's faces, which can lead to mistaking someone for another person who looks similar but is actually quite different when certain distinguishing features are removed.
34:33 There are approximately 80,000 people walking around who look like each other enough to cause the internet to go crazy if they were to meet and take a picture together.
39:12 Our ability to recognize faces is due to a region of our brain called the fusiform gyrus, which is specifically dedicated to seeing faces, and this ability is innate rather than learned.
44:16 Facial recognition AI has shown to have significant flaws, particularly in its accuracy with recognizing faces of people of color, leading to wrongful accusations and imprisonment, highlighting the need for more diverse training data.
49:27 Doppelgangers have been used throughout history by various individuals, including Kim Jong Un, Saddam Hussein, Stalin, and a British general named Bernard Montgomery, for purposes such as deception, distraction, and protection.
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