SO they show the graph of new Covid cases in the US all the time. It is really growing. There is the running seven day average line running through the data, but it is averaging the daily data, which is visible around the line. WHat strikes me - other than my wife's fist - is that that data seems to be cyclic on roughly a weekly pattern. A regular up and down all along the average. It has been that way all along, too regular to just be chance.
SO I am wondering what causes this regular oscillation in the graph. Do cases tend to get reported on fridays? SOme other artifact of the data collection? I find it hard to believe the disease actually infects more towards the end of the week. Or maybe over the weekend, fewer folks get infected? Seems unlikely, but what do I know? Not that, I guess.