![Effect of wearing N95 respirators on Wuhan Doctors & Nurses over long 12 hour shifts](https://pbs.twimg.com/media/EVfVVg_UMAIypGl.jpg)
![Population adjusted confirmed cases of COVID-19 by country, April 13, 2020. Source: Our World in Data.](https://pbs.twimg.com/media/EVfYpv3U4AUhsiK.jpg)
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![](https://pbs.twimg.com/media/EVfj759UwAI__m9.jpg)
![](https://pbs.twimg.com/media/EVfqV_5U4AU29As.jpg)
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