· Updated:

There are a lot of misconceptions about the supposed harm that comes from wearing masks as seen in protests at civic meetings and incidents at supermarkets — chiefly that wearing them reduces intake of oxygen or can lead to carbon dioxide poisoning. Here comes the science.

Jay, a registered nurse from Oakland, gives a demonstration with a pulse oximetry sensor, showing that even with three surgical masks there was no significant change in his oxygen saturation levels. He also measures whether wearing three masks will cause dangerous "carbon dioxide retention." The answer is pretty explicitly no.

"Wear your mask. You do not have a reason to not wear a mask, at all," he concludes.

[Via Reddit]

Digg is the homepage of the internet, featuring the best articles, videos, and original content that the web is talking about right now. It's also the website you're on right now.

Want more stories like this?

Every day we send an email with the top stories from Digg.


Most people think of tides as regular and predictable. But oceanographers have recently started to realise that tides in many places around the world are undergoing notable changes, in ways that can't be explained by interactions among celestial bodies.


John Hersey's article titled simply "Hiroshima," which comprised the entire feature space in the August 31, 1946, issue of The New Yorker, has been called by many the greatest, or at least the most important, journalistic achievement of the past century.

'It's the only newsletter that always engages me'
 →  Get the Digg morning newsletter
See a sample

👋 Welcome to Digg

Thanks for creating an account! Your accounts lets you Digg (upvote) stories, save stories to revisit later, and more.

📩 Stay up-to-date

Email will be sent to:

Select the newsletters you’d like to receive. You can change your subscriptions any time in your user settings.

🎉 You’re all set!

Enjoy your new account! As a reminder, you can change your profile and email settings in your profile.

View account