Researchers at MIT used real-time observations of sneezes/coughs and various models to determine how far your...uh...bodily fluids travel. They found that the droplets have the potential to form clouds, greatly extending their travelling range.

If you look at Figure 18 of their paper, a droplet 30um in diameter can reach heights of 4+ meters, and distance of 2.5 meters. This range is probably even larger for smaller particles, meaning an errant sneeze can quickly spread through a room and into a ventilation system. Keep that in mind for the next flu season.

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Morals of the story: Cover your damn mouth/nose. You guys are all disgusting, germ expellers. And those face masks aren't that useless after all.