Is it true that people have “tongue prints”?
Yes. All human beings have some traits that are the same, but each individual person also has a set of traits that are different from any other. Among these individual traits are fingerprints, tongue prints, patterns in the iris of the eye, and voice patterns. Because fingerprints and tongue prints are unique in every person (even identical twins), they can be used to identify an individual. (But next time someone calls out your name, it’s best to answer rather than stick out your tongue!)