Which Face Masks Work Best?

The video discusses research from Duke University on the effectiveness of different types of masks. It explains the test setup used to evaluate mask performance, highlighting that N95 masks without valves and surgical masks are most effective. The study also found that bandanas and neck fleeces are less effective, sometimes even harmful. The researchers emphasize the importance of wearing masks to protect oneself and others, and provide guidance on how to test mask effectiveness using simple tools.

What new insight or understanding did you gain from this video?