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.

The variety of fitness trackers means there is something for everyone. Some devices may be particularly useful for specific areas — for sleep tracking, for example, you can't beat an unobtrusive ...

Apple has been working on a foldable iPhone for multiple years now, and we've been hearing rumors for more than a decade. Information is ramping up, and it looks like we're going to see Apple release ...

Nissan's Leaf was once a pioneer. For 10 years — from its launch in 2010 to Tesla's sudden rise in 2020 — it was America's best-selling EV. But the trendsetter whithered on the vine. The unathletic ...