Why we're still arguing about masks and the origins of COVID-19

In recent weeks, a few government agencies revived the so-called lab-leak theory of COVID-19, while a credible study questioned the efficacy of masks in preventing its transmission. But while it might look like the conventional wisdom surrounding the virus has been upended, the truth is far more murky.

Derek Thompson of The Atlantic joins Here & Now's Deepa Fernandes to explain.