Quote:
Originally Posted by NatCh
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What you do is let your tongue stick out of your mouth very slightly, so that it's visible between your lips (so it looks kind of like you have three lips), but not hanging way out. I don't know why, but folks tend to leave you alone a lot more when you do this.  ... |
I do this naturally and all the time, without even knowing I'm doing it, when I'm concentrating. I have since childhood (I'm 37 now). My new nephew (2yo) has just started doing it too. Truth.
It's a cooling fin for the brain.
Cheers,
Marc