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CG3HH t1_iyezjk8 wrote

It is nearly universal. There are 2 main reasons, fear of blowing germs around (I can kinda sorta understand this one) and the other one is that a big jump in temperature (my sister in law claims it is a difference of 8 degrees C) somehow makes your immune system unable to function. I dunno about that last one, some german should chime in.

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