PREVIEW: Author Leila Philip, "Beaverland," explains how the North American river system is beaver-built. More later.

PREVIEW: Author Leila Philip, "Beaverland," explains how the North American river system is beaver-built. More later. 1870 BEAVER DAM

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The John Batchelor Show is a hard news-analysis radio program on current events, world history, global politics and natural sciences. Based in New York City for two decades, the show has travelled widely to report, from the Middle East to the South Caucasus to the Arabian Peninsula and East Asia.