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@johncarlosbaez It's kind of 'obvious in hindsight', but I didn't know it until considering a hypothetical in a murder mystery.
Are twins the worst plot device in some stories, after time travel? (And I *like* some stories featuring twins or time travel 
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@johncarlosbaez "Identical twins do not have the same fingerprints however, because even within the confines of the womb, the fetuses touch different parts of their environment, giving rise to small variations in their corresponding prints and thus making them unique." https://en.wikipedia.org/wiki/Twin#IdenticalTwins
