I agree it's common, but why is that evidence for it being about CO2?

My understanding had been that it was primarily about avoiding condensation and making it easier to exhale.

Mostly for fun, though I do think having that kind of distance allowed me to be more critical of myself.

you are breathing back in exhaled CO2

Enough to matter?

I would have guessed so, but this one is actually super comfortable.

I haven't noticed any reactions.

Yes, it doesn't fit super well with glasses. I just put them on over and while its not ideal it doesn't bother me too much for the subway ride.

Thanks for sharing this! I'd love to see more orgs posting these kinds of updates.

Sorry, which cars are you talking about here?

Four years on, with kids now 11y, 9y, and 4y, we've continued to be pretty happy with a Honda Fit (small, five seats) for moving our family around.

If I did that, people in photos would often be recognizable. It retains completely accurate posture, body shape, skin color, clothing, and height. I've often recognized people in this kind of image.

(I haven't voted on your comment, but I suspect this is why it's disagree voted)