What gives Japanese kimonos their luxurious appeal? Pure silk, a natural fiber made from the cocoons of the silkworm. Strong and elastic, silk is used to make strings for the shamisen, as a canvas for Japanese paintings, and these days it is being applied in medicine. With our expert guest, Takayuki Nagashima, who knows a great deal about silk and silkworms, we explore the importance of silk to Japan's culture and way of life. And in Plus One, the wonders of wild silk.