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COVID-19, pandemic influenza and tuberculosis are examples of the remarkable ability of infections to use the respiratory route of transmission. Infections which use this route can often spread very quickly, especially in crowded indoor environments. Human behaviours and engineering should be seen as much a part of our defences against respiratory infections as drugs and vaccines.
Early computers were either designed to do one thing or, if they were programmable, a program would run, and then a new program would be run. But a modern computer gives the appearance of doing multiple things at once.