NASA Astronaut Christina Koch has an inspiring conversation with Reshma about how to avoid being held back by fear, the challenges and wonders of going to space, and the importance of sisterhood. Plus, Reshma interviews Jenna Arnold, an organizer of the National Women's March about her new book: Raising Our Hands: How White Women Can Stop Avoiding Hard Conversations, Start Accepting Responsibility, and Find Our Place on the New Frontlines.