On this week's* "60 Minutes,"* Investigators believe Russia is behind a massive cyber hack that hit several federal agencies, including the Treasury, Commerce, and Justice Departments. Bill Whitaker has the story. In an interview with Anderson Cooper, Microsoft founder Bill Gates says climate change is biggest challenge ever faced by humanity. And Decorated Olympian Simone Biles talks to Sharyn Alfonsi about the cancellation of the 2020 Olympics, and her doubts about competing again.
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