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RE: Mind-Blowing fact [ Admit it, you tried blowing! ]
I think it has to do with evaporation. When you blow "haaaaaaah" it's like a yawn an the air feels warm but when you blow "whoooooooh" it's a stream of air and it feels cooler like how a fan feels cool when it blows the air on you.
Jup, must be something like that.