On this edition of “60 Minutes,” investigators still do not know what triggered the collapse of a 12-story beachfront condominium in Surfside, Fla., last summer, killing 98 people. Sharyn Alfonsi reports on the federal and local investigations and how the catastrophe is expected to impact the affordability of condo living for hundreds of thousands of Floridians. Jon Wertheim reports from Lithuania on a group of resistance fighters who risked their lives to save a trove of Jewish artifacts during and after the Holocaust. Lesley Stahl profiles Sona Jobarteh, the first female virtuoso player of a centuries-old West African instrument called the kora.

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