Dr. Jon LaPook reports about a successful clinical trial for a gene therapy for sickle cell anemia that may be a cure for the painful, chronic and often deadly disease, produced by Denise Schrier Cetta and Megan Kelty. Lesley Stahl reports from Jordan on how the creators of the legendary children’s show Sesame Street have joined forces with the International Rescue Committee to address the needs of Syrian child refugees by bringing a new gang of Muppets to the Middle East, produced by Shari Finkelstein. Sharyn Alfonsi profiles the blind and truly gifted emerging jazz pianist, Matthew Whitaker, who's wowing audiences all over the world at just 18 years old and continuing to develop his prodigious talent, produced by Katy Textor, Kate Morris and Michael Karzis. These previously broadcast segments have been updated for summer viewing.