Last year, COVID-19 changed the economy so fast that economists needed a different kind of data to help them understand it. Monthly indicators based on government survey data that take weeks to ...

As economists and policymakers try to understand the impact of COVID-19 in real time, they’ve tapped nontraditional sources of economic information such as restaurant reservations, hourly-employee ...

Wing-beat-frequency data for a variety of flying animals versus the square-root of the animal mass divided by the wing/fin area. A single universal equation can closely approximate the frequency of ...