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Well actually we all, or at least a number of us can remember, during the COVID pandemic the rules and the rule of thumb was maintaining six feet of distance from every other person when waiting in line to avoid transmitting the virus. And this was the advice that was given back then. And the advice didn't take into account complicated fluid dynamics covering how airborne particles actually travel through the air and people are also walking and stopping. When they were talking about maintaining six foot distance back then they were thinking more in terms of standing in line waiting for things. And now there's a study, a team of researchers, led by two undergraduate physics majors at the University of Massachusetts, Amherst. They modeled how aerosol pumps spread when people are waiting and walking in line. And aerosols published recently in Science and Science is part of the question, what's the science behind six feet of separation? And you may even ask yourself, what is happening physically to the aerosol pumps? Breathing out while waiting in line. It is a six foot guideline, the best way to design out the line up.