This is an update of a posting I wrote back in March 2020 in the first wave of COVID19 just rising mostly in states where COVID19 first arrived. We are in danger again of having local hot spot states now like North Dakota, South Dakota, Texas, where the percent daily increases in cases exceed 5% per day. Early in 2020, we were up to a national average of 12% per day in the first wave. Rates one month ago had dropped well below 1% but now the average US daily increase in cases over last week had risen to 1.5 % per day, but that is the average of all 50 states. In hot states now we are having community locations with over 5% daily increases, and the experience in March will now happen again in November and December 2020. When you have a constant percent daily increase in case number, this percentage factor leads to an acceleration in numbers that can easily and suddenly fill a hospital. Here is the reason, the simple math behind it all. The Rule of 70.