August 03, 2016:

1. Top Republicans Turn on Trump, Endorse Clinton (13 min)

2. New Study Finds Depression in Our Genes (6 min)

3.  How Big is the Zika Threat in America? (4 min)

4. Rio to Host First Olympic Refugee Team (6 min)

5. Comedy Genius and Controversy: Remembering Lenny Bruce (7 min)