Your DNA is 99.9% identical to a strangers
Genetically, all humans have about 99.9% of their DNA in common. All the differences between you and a stranger are within the remaining .1%. If that isn’t shocking enough, you share about 98.8% of your DNA with a chimp.
Some idiot didn't get the science facts right, there is a DOMINANCE of one nostril, and it shifts every couple of hours to another one, but it sure is not 100% one nostril, in normal circumstances.