5/31/2020: The Promise of Plasma, Spilling Across The Border, Perseverance

Until a vaccine is found, plasma therapy has been helping COVID-19 victims get better. Bill Whitaker has the story. Raw sewage from Tijuana is appearing on southern California's coasts. Lesley Stahl reports. And NASA is attempting to find signs of ancient life on Mars with the launch of Perseverance. Anderson Cooper has the story on this week's "60 Minutes."

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