Happy Sunday. Our most popular stories of the week are listed below.

Understanding the pandemic has meant grappling with lots of data and some fairly sophisticated science. But sometimes a personal narrative can bring home a crisis in a way numbers and models can’t. That’s what Professor of Social Epidemiology Margot Gage Witvliet offers in this story about her own long fight with COVID-19.

Emily Costello

Deputy Editor

Open windows are the easiest way to ventilate a room. Justin Paget / Digital Vision via Getty Images

How to use ventilation and air filtration to prevent the spread of coronavirus indoors

Shelly Miller, University of Colorado Boulder

Good ventilation can reduce the risk of catching coronavirus. An environmental engineer explains how to know if enough outside air is getting into a room and what to do if ventilation is bad.

A psychoactive substance to make you act in everyone’s best interest? Sayanh Kaew Mni/EyeEm via Getty Images

‘Morality pills’ may be the US’s best shot at ending the coronavirus pandemic, according to one ethicist

Parker Crutchfield, Western Michigan University

Rather than a vaccine to beef up your immune system, a psychoactive substance could boost your cooperative, pro-social behavior – curtailing the selfish actions that spur on coronavirus's spread.