Your tongue print is completely unique, just like a fingerprint.
Why it is true
The shape, texture, and patterns on the surface of every person's tongue are different, which researchers are studying for use in advanced biometric security systems.
Source: Biology
Would you rather be asked first?
This is the reading side of the site, so the answer is in the sentence above — that is the whole point of it. Test yourself works the other way round: the question comes on its own, and the fact and the explanation only appear once you have answered.