Updated at 10:36 a.m. ET on August 5, 2020. Thereâs a joke about immunology, which Jessica Metcalf of Princeton recently told me. An immunologist and a cardiologist are kidnapped. The kidnappers threaten to shoot one of them, but promise to spare whoever has made the greater contribution to humanity. The cardiologist says, âWell, Iâve identified drugs that have saved the lives of millions of peopl
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