Two stories for the 4th of July: In part 1, "Lift Ev'ry voice and Sing," also known as the black national anthem. We'll hear performances of the song as historian Imani Perry discusses its meaning and importance to the civil rights struggle. In part 2, Frank Kameny recalls the early days of the gay rights movement. Kameny, now 85, led some of the first public demonstrations for gay equality, picketing the White House and staging 4th of July protests in the mid-1960s.

Writer Kathryn Schulz considers what it means to be wrong, how we feel about it and how we deal with it. In her new book “On Being Wrong,” Schulz examines the sources of human error, and says that rather than try to perfect ourselves, we need to embrace our fallibility.

Writer Kathryn Schulz considers what it means to be wrong, how we feel about it and how we deal with it. In her new book “On Being Wrong,” Schulz examines the sources of human error, and says that rather than try to perfect ourselves, we need to embrace our fallibility.

Composer David Cope discusses his 30-year investigation into the nature of musical creativity. Cope's computer programs generate new musical works in the style of historical composers, as well as original modernist compositions, delighting and/or enraging lovers of classical music. We listen to some of his old and new compositions, and consider what they reveal about art, originality and human intelligence.

Composer David Cope discusses his 30-year investigation into the nature of musical creativity. Cope's computer programs generate new musical works in the style of historical composers, as well as original modernist compositions, delighting and/or enraging lovers of classical music. We listen to some of his old and new compositions, and consider what they reveal about art, originality and human intelligence.

Developmental psychologist Paul Bloom explores the nature of human pleasures, from sex and food to art, music and fantasies. He says that what we like depends on what we think, and there may be no such thing as purely physical pleasure. He discusses his new book, "How Pleasure Works: The New Science of Why We Like What We Like."

Developmental psychologist Paul Bloom explores the nature of human pleasures, from sex and food to art, music and fantasies. He says that what we like depends on what we think, and there may be no such thing as purely physical pleasure. He discusses his new book, "How Pleasure Works: The New Science of Why We Like What We Like."

Wes Moore was a Rhodes Scholar on his way to a successful career when he learned of another Wes Moore, wanted by police for murder. He discovered surprising parallels in their two lives, despite their divergent paths. Wes Moore discusses his book "The Other Wes Moore: One Name, Two Fates"

Wes Moore was a Rhodes Scholar on his way to a successful career when he learned of another Wes Moore, wanted by police for murder. He discovered surprising parallels in their two lives, despite their divergent paths. Wes Moore discusses his book "The Other Wes Moore: One Name, Two Fates"

Comic and actor Paul Provenza (director of "The Aristocrats") and photographer Dan Dion take a searching look at contemporary comedy in their book "Satiristas," featuring conversations with and photos of many of today's leading satirical artists. Paul and Dan discuss the craft of comedy and the issues confronting contemporary comics.