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Mehdi Benatiya Andaloussi talks about his calculation of how many lives would be saved by the end of 2021 if vaccines were shared more fairly - and how many have been lost because this hasn't happened so far.
Eric Schneider talks about how he used the London's Foundling Hospital data on children's health to discover surprising information about the link between nutrition and common childhood illnesses.
In Italy, sick workers may now get a surprise home visit from the doctor. Tito Boeri talks how effective this has been as a cure for "Friday morning fever".