Embedded Player NPR Science Correspondent Joe Palca answers listener questions about vaccine development, and medical experts tackle questions sent in by kids.

These excerpts come from NPR's nightly radio show about the coronavirus crisis, The National Conversation. In this episode:

-NPR Science Correspondent Joe Palca explains how vaccines are made and the unique challenges associated with COVID-19.

-Kids' questions are answered by pediatric nurse practitioner Suzannah Stivison from the Capitol Medical Group in Washington, D.C., and Dr. Wanjiku Njoroge, medical director for the Young Child Clinic at Children's Hospital of Philadelphia.

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This episode was recorded and published as part of this podcast's former 'Coronavirus Daily' format.