It is really hot, and humid here. I have my fan running almost constantly. Ever since I was a kid (well I am still kind of young) I have talked into my fan and got a kick out of hearing my distored alien voice. I was wondering what is the physics behind this distorsion? I was thinking that the sound waves just simply get bounced back at different times since the blades are kind of behind each other on each pass, and since its going so fast you can hear the effect. I am probably way off but thats all I could think of. Another thing why is it that I feel cool when the fan is on? I was thinking that it pushes all the humidity, and gas away from where I am providing a lower density of air, and water which would mean less energy in that area and less heat. Is that right?