I thought the video did a great job of demonstrating that masks are primarily to prevent us from spreading virus to someone else. THEIR mask prevents THEM from spreading to us. It also made very clear that leaving the nose uncovered pretty much makes the mask useless, as aerosols also disperse from our nose when breathing.
Again, we don't wear masks for our own protection so much as to keep ourselves from potentially spreading to others. We never know if we could be asymptomatic or pre-symptomatic - especially if we're out doing signings around others multiple times a day, regardless of the circumstances.
The best way to ensure our own safety (aside from the expense of always wearing an N95 mask) is to make sure those around us are wearing masks... IMO, a major reason this thing is so out of control and spreading so rapidly is because so many people are thinking about themselves only and not about all the others they come in contact with throughout their daily activities.
Let's not be selfish, people. Please wear a mask - and cover your noses! Yeah, they're not comfortable, but the minute I get back into my car (alone), I pull mine off one ear (without touching the front), let it hang, and take a deep breath...
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