Understanding the transport of droplets in the air, introduced byfoul play or accident are key processes in forensic science and thespread of infections. We illustrate these problems using a highprofile murder case in the UK and airborne transmission of disease.Both problems involve trying to understand the short and long rangetransport and fate of droplets and particles. The transport of a finemist of droplets ( of blood or mucus) caused by coughing, breath-ing, sneezing or displacement of the lung cavity are largelydetermined by the presence of coherent vortical structures ( close tothe human body), evaporation ( in the case of disease transmission)or mean I turbulent flows (for long range transport). The exampleswe introduce demonstrate how simple physical models can be usedto
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