How scientists trained computers to forecast Covid-19 outbreaks weeks ahead

A man (left) arrives at a coronavirus testing site without wearing a facemask in Los Angeles on Dec 16, 2020. — AFP/Getty Images/TNS

Imagine a time when your virus-blocking face covering is like an umbrella. Most days, it stays in your closet or is stowed somewhere in your car. But when a Covid-19 outbreak is in the forecast, you can put it to use.

Beyond that, an inclement viral forecast might induce you to choose an outdoor table when meeting a friend for coffee. If catching the coronavirus is likely to make you seriously ill, you might opt to work from home or attend church services online until the threat has passed.