On tonight's CBS Evening News podcast - the largest vaccine trial for COVID-19 enters Phase 3 at over 80 sites in the US -- is there reason for optimism and when might we know if the vaccine works? Also - discouraging news for fans of America's pastime; two Major League Baseball games now cancelled after more than a dozen players on the Miami Marlins test positive for COVID-19. What this could mean for the future of the season.
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