On this week's "60 Minutes," Scott Pelley reports on how first responders and emergency rooms are changing their protocols regarding mass shootings. Anderson Cooper takes us inside The Clotilda, the wreck of the last ship known to have brought enslaved Africans to America. And Sharyn Alfonsi speaks with the gold medal-winning gymnast Simone Biles. See Privacy Policy at https://art19.com/privacy and California Privacy Notice at https://art19.com/privacy#do-not-sell-my-info.