“In study after study, we see that super-spreading clusters of COVID-19 almost overwhelmingly occur in poorly ventilated, indoor environments where many people congregate over time—weddings, churches, choirs, gyms, funerals, restaurants, and such—especially when there is loud talking or singing without masks.” In The Atlantic, the excellent Zeynep Tufekci explains the key factors that lead to coronavirus outbreaks. This Overlooked Variable Is the Key to the Pandemic.

+ Sadly, the virus has resurged in many places around the world, including Italy. Here’s the latest.