Gizmodo: “Although Instagram founders Kevin Systrom and Mike Krieger left the photo sharing app they created in 2018, which is owned by Facebook, they apparently aren’t done working together. Their latest project is Rt.live, a state-by-state covid-19 infection tracker. The tracker calculates Rt, or the effective reproductive rate, which is the virus’ transmission rate a given time. In other words, the metric is the estimation of how many secondary infections are likely to develop because of a single infection in a specific area. If the number is above one, it means we should expect more cases in that area. On the flip side, if it’s below one, we should expect fewer cases. Rt.live takes this concept and puts it on a simple, but pretty, tracker (and we would expect nothing less from the founders of Instagram). The tracker shows you what the current effective reproductive rate (Rt) is in all states. Those that have an Rt below one are shown as little green dots, while those that have an Rt above one are shown in red. As of yesterday, April 18, only 15 states had an Rt below one. With 0.42, Connecticut had the lowest score. North Dakota, which has no shelter in place order, had the highest score with 1.7.//” [h/t Pete Weiss]