A.M. Edition for Aug 28. Nvidia posts another record quarter, but Journal Heard on the Street columnist Dan Gallagher says its $4 trillion-plus valuation sets an awfully high bar that even strong numbers don’t always meet. Plus, The White House says it has fired the director of the Centers for Disease Control, following clashes with Robert F. Kennedy Jr. over the agency’s guidance on vaccines. And WSJ economics reporter Justin Lahart unpacks new research that shows AI’s effect on job prospects for young Americans. Azhar Sukri hosts.

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