War, pandemic and sluggish markets hit the world’s billionaires this year. There are 2,668 of them on Forbes’ 36th-annual ranking of the planet’s richest people—87 fewer than a year ago. They’re worth ...

Mosquitoes can quickly make a pleasantly warm evening unbearable—so much so that you might decide to stay inside rather than deal with the annoying, biting pests. You might think that a bug zapper is ...