It was the year that Pokémon first aired on American TV, Cher dominated the radio with obvious auto-tune, and (appropriately enough) both Armageddon and Deep Impact were among the 10 highest-grossing ...

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.

If you were asked to define your next move to ignite revenue growth, would you suggest firing 60% of your clients? How about grinding iPhones in a kitchen blender? No? OK, how about deploying ...