Roald Dahl's daughter Ophelia on her childhood and "magical dad"

In an exclusive and personal interview, Ophelia Dahl, daughter of author Roald Dahl, sat down with Yahoo Global News Anchor Katie Couric to discuss a letter he wrote about the measles vaccine, originally published in 1988, that went viral this week. She talked about her childhood with the beloved storyteller and revealed the advice he gave her that would shape her life’s work.

{Watch: Ophelia talk about the story behind Roald Dahl's viral letter}