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A side benefit of the paper towel is that in-swinging doors can be pulled with the paper, not your hand. Imagine how many people _didn't_ wash their hands then pulled that door.

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Trivially fixable by a little foot hook on the bottom of the door intended to be used to open the door after you're done.

What if you have no foot? Or the foot hook isn't there? Or you have to turn a knob?

Plus pipelining.

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