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The optimal blade pitch angle is 14 degrees. It optimizes airflow and decreases temperature stratification. And they're much more efficient than air conditioners -- all the energy societies recommend them -- a quality fan can be just as good as an air conditioner. I mentioned this because I looked up this question early and just got studies about optimal pitch angles and lost interest. I just remembered the 14% part..
Oh and yea, just grab the glass and twist. Little teeny dab of superglue on three fingers right before you grab the glass if you really need to wrench on it. The key here is teeny.
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"I'm typing on a computer of science, which is being sent by science wires to a little science server where you can access it. I'm not typing on a computer of philosophy or religion or whatever other thing you think can be used to understand the universe because they're a poor substitute in the role of understanding the universe which exists independent from ourselves." - Willravel
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