Overview: Twenty years ago, 9/11 changed the world. People struggled to make sense of the terrible acts, and to rebuild their lives in its aftermath. After the death of his father, David Filipov goes to Afghanistan where a Pop-Tart takes on a whole new meaning; psychology professor Michael Sargent confronts his biases on an airplane; and Jude Treder-Wolff finds seeds of hope to fuel her work as a therapist.