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An expert in climate change research, Paul Mayewski led the National Science Foundation's Greenland Ice Sheet Project 2. The project extracted ice cores chronicling 100,000 years of climate history. Mayewski, with co-author Frank White, writes about their expeditions in the new book, The Ice Chronicles: The Quest to Understand Global Climate Change (University Press of New England). Mayewski is also co-director of the Institute of Quaternary and Climate Studies at the University of Maine.

Science fiction writer Sheri S. Tepper is the author of over a dozen novels including, The Fresco, The Family Tree, Grass and her newest, The Visitor. (Harper Collins).

Dr. Brewster Higley never knew the poem he wrote while sitting near a creek would become one of America's best-loved songs. On Morning Edition, NPR's Steve Lickteig reports on "Home on the Range" and how it changed its tune over time. The story is part of the Present at the Creation series.

Senate debate begins this week on ways to add a prescription drug benefit to Medicare. Fifteen years ago, Congress passed such a measure, only to repeal it a year later under a storm of criticism. NPR's Julie Rovner reports for Morning Edition.

Journalist Jon Cohen writes for Science Magazine. He just got back from the 14th International AIDS conference where he reported on the AIDS vaccine and anti-HIV drug therapies. His article "Designer Bugs" in the July/August edition of The Atlantic Monthly is about how scientists have the ability to create synthetic viruses in the lab, like mousepox and polio, and the controversies and dangers this presents.

Researchers and activists are in Barcelona this week to talk about the global AIDS epidemic. But another epidemic of similar size is sweeping the globe: tuberculosis. A major push is on to expand TB treatment, and as NPR's Richard Harris reports from Kenya, the treatment is working, even under some of the most challenging conditions.

Brazilian physicist Marcelo Gleiser is the author of the new book, The Prophet and the Astronomer: A Scientific Journey to the End of Time (WW Norton). In it he explores our relationship to the sky and how it has influenced religion and then in turn - science. He writes, 'one of my goals. . is to humanize science, to argue that our scientific ideas are very much a product of the cultural and emotional environment where they originate'. Gleiser is Professor of Natural Philosophy and professor of physics and astronomy at Dartmouth College.

Puzzle master Will Shortz quizzes host John Nielsen and an in-studio guest whose voice is very familiar to our listeners. Will repeats the two-week creative film challenge he gave last week.

Pianist and singer Michael Feinstein. His repertoire is American popular song and he is a collector of vintage recordings and musical memorabilia. In the fall he plans to release a collection of radio duets by Bing Crosby and Rosemary Clooney, on his new record label Feinery. Feinstein released a new CD with the Israel Philharmonic Orchestra, Michael Feinstein and the Israel Philharmonic Orchestra (Concord).

Fifty years ago, Folkways Records released a six-album set of recordings that had a profound influence on the folk music revival and later on rock music. Morning Edition has the story of Harry Smith's The Anthology of American Folk Music. NPR Online offers a selection of songs from the collection.