Figure 2. Sneezing in a subway car. The sneezing occurs in the middle of the car, towards the right. The particles that are emitted by the sneezing passenger are colored according to the logarithm of the diameter, with red representing the largest particles and blue representing the smallest particles. Note the quick dispersion of particles due to the air conditioning ventilation; some particles enter the left portion of the subway car. The health implications are obvious. Figure courtesy Rainald Löhner and Harbir Antil.
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