The segregated cemeteries of Clearwater, FL were sacred ground until the ground became valuable. Scott Pelley speaks with residents who saw the cemeteries built over. It is widely known dogs evolved from wolves, but how did they become so friendly? Anderson Cooper meets with an evolutionary biologist and geneticist to find out. See Privacy Policy at https://art19.com/privacy and California Privacy Notice at https://art19.com/privacy#do-not-sell-my-info.