Accessibility links
Skip to main content
Keyboard shortcuts for audio player
Embedded Player
Emily Oster wanted to understand the risks of opening schools. So she started a massive data collection campaign. | Subscribe to our weekly newsletter
here
.
<img height="1" width="1" style="display:none" src="https://www.facebook.com/tr?id=1621557368158968&ev=PageView&noscript=1" />