Identical twins do not have identical fingerprints

If that is true — and it is — then how can they be identical?

"Identical: Agreeing exactly."

Danielle Liubicich, then a Ph.D. candidate in the laboratory of Howard Hughes Medical Institute (HHMI) investigator Nipam H. Patel, Department of Integrative Biology at the University of California, Berkeley, explained the details in a 2007 article on HHMI's "Ask a Scientist" website; the piece follows.

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More here, here and here.