Everything in moderation: YouTube

Susan Wojcicki, YouTube’s chief executive, tells our correspondent that moderating the streaming giant’s content is her biggest challenge. No wonder: every minute, 500 hours-worth of it is added. Also, how West African research is being used to address gun violence in Chicago. And a look at the declining number of royal families, and why some that have survived will stick around. Hosted on Acast. See acast.com/privacy for more information.