As the number of cases of covid-19 rises over 100,000 around the world, scientists and governments are working around the clock on treatments and vaccines. Our science editor, Geoffrey Carr, explains the genetic make-up of the virus. Mark Suzman, CEO of the Bill and Melinda Gates Foundation, Rupert Beale from the Francis Crick Institute, and Regina Barzilay from MIT explain their attempts to thwart the outbreak. Plus, we turn data outlining the fatality rate by age into sound. Kenneth Cukier hosts 

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