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Is the chilling truth that the decision to impose lockdown was based on crude mathematical guesswork?

We now know that the model’s software is a 13-year-old, 15,000-line program that simulates homes, offices, schools, people and movements. According to a team at Edinburgh University which ran the model, the same inputs give different outputs, and the program gives different results if it is run on different machines, and even if it is run on the same machine using different numbers of central-processing units.