All the latest headlines explained – Why are vaccines being flown around the country when they are not yet FDA-approved? What are the new CDC quarantine guidelines? Was Covid in the U.S. as early as December? Plus, what you can do about “quarantine constipation.”

CDC Director Rochelle Walensky gave the final sign-off allowing kids 5 to 11 to get the vaccine. What she has to say to parents who are hesitant or worried vaccinations may become a school mandate.