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What Happened Today: Boston Marathon Is Canceled, Vaccine Questions NPR's science correspondent answers listener questions about the pace and process needed to develop a viable coronavirus vaccine.

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What Happened Today: Boston Marathon Is Canceled, Vaccine Questions

Heard on All Things Considered

Joe Palca

What Happened Today: Boston Marathon Is Canceled, Vaccine Questions

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NPR's science correspondent answers listener questions about the pace and process needed to develop a viable coronavirus vaccine.