Yeah but I get what Tomo means.
Why a mole? Why? Why that specific seemingly random number?
And the tongue rolling thing, I refuse to believe that its "genetic". No one can roll their tongue into a tube
without the use of the cheeks/lips. Try it. You physically
have to make an O shape with your mouth.
Now the tongue is made of many muscles, but essentially the muscles are symmetrical on either side - the main muscle being the genioglossus FYI (not often you get to fire some anatomy wisdom into a convo

). So if you almost "relax" your tongue, make an "O" shape with the lips, and thrust the tongue out, voila. The tongue is rolled. Why? Because its the easiest way for it to fit through the space presented to it.
Please please please, if I am wrong, point me in the direction of some proper proof that I am wrong, a bloody Cochrane review would be preferable. I had an argument with my friend over this one time, and I refuse to leave it be!
And I think this because I cannot whistle. Not because I physically cannot, but because as a child I never put the time and effort into trying to whistle. Probably because I was always rolling my bloody tongue...