Virus

NEW YORK, NEW YORK - SEPTEMBER 20: Apple CEO Tim Cook greets customers at the reopening of Apple's flagship retail store, Apple Fifth Avenue on September 20, 2019 in New York City.Taylor Hill | WireImage | Getty ImagesApple temporarily…

This article is part of the On Tech newsletter. You can sign up here to receive it on weekdays.Some state health officials are giving Americans the option to be notified on their smartphones when they've spent time around someone who later…