The Dartmouth Atlas of Health Care highlights the wide variations in how health care is delivered across the United States. The project is run by Center for the Evaluative Clinical Sciences at Dartmouth Medical School. Online tool provides comparisons by geographic region (state, HSAs-Hospital Service Areas, or HRR-Hospital Referral Region) for Medicare healthcare use (data through 2015). While the tool is relatively easy to use, the conceptual understanding of the reports requires technical sophistication. A old timelapse map of the growth in COVID cases across the US during 2020 is also shown.