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what is the difference between the tube shaped oral airways and the "I"beam shaped ones? advantages, disadvantages, preference, any difference at all?

how is it that giving compressions and rescue breathing at the same time during CPR allows air into the lungs? i would think that this would have an adverse effect on what was trying to be accopmlished. explination prease...

i have a pov with a couple blue lights and i sometimes see cops or other vehicles with the light placed in the upper right side of the windshield rather than centered or to the left (which would make more sense to me so the car ur passing can more easily see it). any explination would...