How much optimism is too much optimism?

“When Dr. Fauci said 12 to 18 months, I thought that was ridiculously optimistic,” says Dr. Paul Offit, an expert in infectious diseases and immunology. What he’s referring to here is the ambitious timeline of developing a vaccine for COVID-19. Optimism is generally taken as a positive trait. In this case, Dr. Offit uses it …

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