Nearly a week ago, inmates at Pelican Bay state prison started a hunger strike. Pelican Bay is a maximum security prison near the Oregon border. Some of the inmates there are housed in extreme isolation units. The hunger strike has spread to 13 other state prisons, and - in the last few days - 6500 inmates participated. That makes it the largest prison strike in California in at least a decade. KPCC's Julie Small joins Madeleine with an update.