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The history of the jungle gym, and its sibling the monkey bars, is full of weird and delightful twists and sub-plots that take us from Japan to suburban Chicago and delve into theoretical math.

The fourth volume in Robert Caro's monumental biography of Lyndon Johnson is The Passage of Power; it explores the period between 1958 and 1964 during which Johnson went from powerful Senate majority leader to powerless vice president to — suddenly — president of the United States. Originally broadcast on May 13, 2013.

William Masters and Virginia Johnson became famous in the 1960s for their research into the physiology of human sexuality. In Masters of Sex, biographer Thomas Maier explores the duo's research methods, which for years remained shrouded in secrecy. Originally broadcast July 30, 2013.

Film critic Roger Ebert is famous for arguing about movies on TV with Gene Siskel. Now that cancer surgeries have left him without the ability to speak, Ebert has found a new voice online. Melissa Block visits him at his Chicago home to talk about his memoir, Life Itself.

Nine years ago, Mengistu was taken by Hamas. A deal on the release of some of the hostages taken on Oct. 7 doesn't appear to include him.

Roland Griffiths spent the later stage of his career exploring the ways that psychedelic drugs, specifically psilocybin, could help patients with depression, addiction issues and even terminal cancer.

The cultivation of opium poppies in Afghanistan is soaring. The Afghan and U.S. governments are working to counter the drug trade.

Porto Alegre, the capital of Rio Grande do Sul, is seeing strikes and protests amid rising crime and Brazil's worst recession. "We're asking God Almighty that this comes to an end," says a resident.

NPR Ed is celebrating 50 Great Teachers. Today: The story of a young algebra teacher in Oklahoma oil country, who has taken an unorthodox approach to classroom math.

China's foreign policy has appeared increasingly assertive recently. What isn't clear is whether this is part of a coherent plan or just an outgrowth of China's increasing stature in Asia and beyond.