Imagine a pond with a single lily pad. Each day, the number of lily pads doubles, and in 30 days the pond is covered. On what day was it half covered? 1% covered? The answers are day 29 and day 24. >> Is COVID-19 Outbreak a Black Swan or the New Normal? https://sloanreview.mit.edu/article/is-the-covid-19-outbreak-a-black-swan-or-the-new-normal/
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