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Sharyn Alfonsi talks to cannabis producers in California three years after the state legalized adult use who are not seeing the legal market develop as predicted and say regulations and a robust black market are to blame, produced by Guy Campanile . Jon Wertheim reports on a letter written by Christopher Columbus describing his discovery of the Americas which became the world’s first best-seller when it was printed, distributed throughout Europe more than 500 years ago. Now the surviving copies are so rare and valuable that they’re being stolen and replaced with forgeries. Katherine Davis is the producer . Scott Pelley tells the remarkable story of the Ethiopian Orthodox Christmas vigil and the pilgrims that have been trekking to this mysterious holy site for centuries to visit its rock-hewn churches carved out of the African plateau, produced by Nicole Young. These previously broadcast segments have been updated for summer viewing.