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Doppelgängers may not just look remarkably alike - they may also share similar behaviours.That’s according to research conducted on people who look extremely similar, but are not related.The researchers found that some doppelgangers share characteristics in genes that are responsible for facial features.These genes can also affect behavioural traits - and shared behavioural traits between the doppelgängers were also verified by the researchers.These can include common habits like smoking and traits such as how people respond to education.