Colin Kaepernick, His Knee, and Changing the World; Author David Zirin Reflects on The Knee That Changed Society

David Zirin, author of "The Kaepernick Effect:  Taking a Knee, Changing the World."  The book tells the stories of some of the athletes (high school, collegiate, and professional)  who have followed the lead of former NFL quarterback Colin Kaepernick and chosen to 'take a knee' during the national anthem.