A R 15 Semi Automatic Rifle Is the Weapon of Choice of the Worst Massacres

Following the massacre at Robb Elementary School in Uvalde, Texas, Scott Pelley revisits a 2018 report on AR-15-style weapons with rounds causing such devastating and often lethal wounds that first responders and emergency rooms are changing their protocols and preparing for the worst. Bill Whitaker reports on the longest-running cattle drive in America, begun 125 years ago and carried on today by the descendants of the original drivers. Anderson Cooper takes a look at the gardens of the Roman emperor Caligula that have been discovered and excavated, and some of the most remarkable finds are now on display for the first time.

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