Absolutely everybody has face doubles.

Identikit got pretty close and there weren't that many bits in there and quite a few of them were hairstyles and that's a choice, not genetics. How many head shapes, noses, eyes, mouths and ears can there be?

A few million? Then everybody has a few thousand doubles. 100 Million? Still 80.

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technothrasher 2 hours ago | parent | next [-]

> Absolutely everybody has face doubles.

I once had a waiter in a restaurant that I'd never been to before swear he'd seen me there many times, and when I denied it he was backed up by some of the other staff. Creepy, to say the least. Afterward I realized I should have given him my phone number and told him to call me next time "I" came in, so that I could meet my doppelganger.

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tartoran 2 hours ago | parent | prev [-]

That's why AI should not be used for identification alone, it's unreliable.

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garciasn 2 hours ago | parent | next [-]

Correct; NIST recommended (~10 years ago) they be used together: https://www.pnas.org/doi/full/10.1073/pnas.1721355115

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lewdev 2 hours ago | parent | prev [-]

There was a case where someone's finger prints matched someone who was later found to have an alibi and not be there.

So even finger prints are unreliable.

	▲	tartoran 44 minutes ago \| parent [-]
		Wow, had no idea. Was it a partial fingerprint match? I wonder if 2 people exist that match exactly all 5 fingerprints, seems close to impossible to me.