i saw this person searching for fossils and she said if you put your tongue on it and it sticks its a fossil but if it

Question: i saw this person searching for fossils and she said if you put your tongue on it and it sticks its a fossil but if it doesnt its probably a rock. is that true?
- Keywords:
  fossil
Asked by anon-279623 on 7 Feb 2021.
- Amy Stockwell answered on 7 Feb 2021:
  
  I’ve seen this being claimed on QI too! It was episode 1 of series P: P-Animals. I hope that it is true.

Question: i saw this person searching for fossils and she said if you put your tongue on it and it sticks its a fossil but if it doesnt its probably a rock. is that true?