CBS Evening News with Norah O'Donnell, 07/21

On tonight's CBS Evening News podcast - what a new study from the CDC found about the effectiveness of hand hygiene, social distancing, and wearing masks on the spread of COVID-19. Also - with sweltering heat in so many parts of the country, what you need to know about air conditioning and the spread of COVID-19. To learn more about listener data and our privacy practices visit: https://www.audacyinc.com/privacy-policy Learn more about your ad choices. Visit https://podcastchoices.com/adchoices