(Note: This show originally aired back in July.) On this installment of ST, we welcome the bestselling author Mark Kurlansky back to our show. Kurlansky's latest book, which he discusses with us today, is "Paper: Paging Through History." It's a detailed and deeply researched volume that both explains and explores one of the simplest and most essential pieces of human technology. For the past 2,000 years or so, the ability to produce paper in ever more efficient ways has supported -- if not driven -- the proliferation of literacy, media, religion, education, commerce, and art.