Every morning I document the numbers of COVID-19 cases in the United States via Worldometer, a site that gets its numbers from state health departments, which obtain theirs from daily county reports. I started this ritual in mid-March because I wanted to see the changes in real time, not just as reported on television.
Historians like myself piece stories of the past together from primary sources: the documents, photographs, artifacts or interviews that tell us what happened, how and why. We evaluate sources according to type, some for information, others to understand the human experience.