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.

Curved or flat, squarish or ultrawide, business or gaming: Shopping for the best PC monitor can feel like hunting for a pixel in a digital haystack. It doesn't have to be that hard, though. We can ...

Want more charts like these? See our charts on the secrets of the jobless recovery, the richest 1 percent of Americans, and how the superwealthy beat the IRS. How Rich Are the Superrich? A huge share ...

A pack of materials and shaders to make a game with realtime shadow from one source (the sun) and a lot of point light sources. The main difference from previous examples (see on the Defold forum) is ...