"Ventilation is the way forward," says infectious disease doctor Abraar Karan of Stanford. Here's how to get better air flow at home, in schools and offices — even in gyms — to stave off COVID.

"Ventilation is the way forward," says infectious disease doctor Abraar Karan of Stanford. Here's how to get better air flow at home, in schools and offices — even in gyms — to stave off COVID.