A version of this story appears in the September 2020 issue of National Geographic magazine. Philadelphia detected its first case of a deadly, fast-spreading strain of influenza on September 17, 1918.

Suzanne is a content marketer, writer, and fact-checker. She holds a Bachelor of Science in Finance degree from Bridgewater State University and helps develop content strategies. Learn about our ...

While copying from one spreadsheet to another, if you get Excel ran out of resources while attempting to calculate one or more formulas error, this guide will help you fix the issue. It happens when ...

Linear graphs are straight-line graphs that visually represent a constant rate of change in the relationship between two variables, showing how one changes in response to the other. They are expressed ...

Abstract: The traditional Erdos-Renyi model of a random network is of little use in modelling the type of complex networks which modern researchers study. In this graph, every pair of vertices is ...

A new study by researchers at Columbia University has revealed the states that have higher rates of arsenic in public drinking water systems, most of which are in the West and Midwest. Michigan, South ...

Roula Khalaf, Editor of the FT, selects her favourite stories in this weekly newsletter. In the four decades since Oliver Sacks wrote The Man Who Mistook His Wife for a Hat, the medical memoir has ...

NEW YORK, March 7 (Reuters) - Federal Reserve Chair Jerome Powell said it remains to be seen if the Trump administration's tariff plans will prove to be inflationary, mapping out a checklist of things ...

A calorie is a unit of energy. In nutrition, calories refer to the energy people get from the food and drinks they consume and the energy they use in physical activity. Calories are in the nutritional ...

There was an error while loading. Please reload this page. PowerShell Script: Azure Sign-In Analysis Overview This PowerShell script connects to Microsoft Graph ...

This calculator was updated in July 2025 to reflect current tax law. The choice between buying a home and renting one is among the biggest financial decisions that many adults make. But the costs of ...