COVID-19 vaccines must be kept at low temperatures. And to move ampuls between freezers, specialists use dry ice. NPR explores whether the U.S. has enough of it to ensure smooth vaccine distribution.
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Sarah Gonzalez
Sarah Gonzalez is a host and reporter with Planet Money, NPR's award-winning podcast that finds creative, entertaining ways to make sense of the big, complicated forces that move our economy. She joined the team in April 2018.