7/3: What's behind the record heat?; remembering Andy Griffith

      |Over the past eight days in the US, more than 2,400 high-temperature records have been tied or broken. So, what's behind the sweltering weather? Chip Reid reports; And, Andy Griffith, best known for portraying the role of sheriff Andy Taylor on "The Andy Griffith Show," died at the age of 86. Bill Whitaker looks back on the man who brought the fictional town of Mayberry to life.

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