It's been 10 years since a gunman killed 20 first-graders and their six teachers at Sandy Hook Elementary School in Newtown, Connecticut. A decade later, the gun-violence prevention movement has never been stronger. Shannon Watts, founder and CEO of Moms Demand Action and Sylvia Bennett-Stone, director of Voices of Black Mothers United, join us. Then, a special flight out of Houston on Wednesday could mark a milestone for disability inclusion in space. K. Renee Horton, a scientist at NASA and one of the 16 passengers, joins us. She lives with what she calls an invisible disability: hearing loss. And, what we consider normal could actually be traumatic. Dr. Gabor Maté joins us to talk about his new book "The Myth of Normal: Trauma, Illness and Healing in a Toxic Culture."