On this edition of “60 Minutes,” Bill Whitaker investigates what happens when the main source of water for the US southwest begins to run dry. Scott Pelley goes to a school in the southside of Chicago to see an act of kindness so profound it can change the lives of those students forever. Jon Wertheim reports from Iceland, which erupts in excitement every year over the musical competition that boasts ABBA and Celine Dion among its most famous winners. 

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