On my last flight to and from Seattle, I wore a mask on the plane.

This was early February and I was only one out of three people on the flight in a mask.

Fast forward a couple of months and that’s changed. I see people in masks everywhere.

But the question remains: are they effective?

Lex Fridman posted a video discussing latest research on masks (cloth, surgical, N95) and how they help in various transmission modes (aerosol, droplet) for source control and as PPE.

Related Links:

• Slides for this video: https://bit.ly/2yCj5U3
• References sheet: https://bit.ly/covid-transmission

Time Index:

• 0:00 – Overview
• 3:05 – Modes of transmission
• 11:03 – Do masks work?
• 14:42 – Takeaways