joeteicher comments on Why Don’t We Apply What We Know About Twins to Everybody Else? - Less Wrong
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maybe they weren't identical twins. Unless they did a genetic test they wouldn't know for sure. I read something once that said that a significant number of same-sex fraternal twins are misidentified as identical.
That is very interesting. I hadn't thought yet that the way we identify twins right now is just by looking at them ("they look pretty much the same, they must be identical").