On the next "Unknowns," host Charlie Stone welcomed Kirk Cameron, the 1980s television star known for his role as Mike Seaver on Growing Pains. The discussion explored Cameron’s unexpected rise to fame, his spiritual transformation from atheism to born-again Christianity, his navigation of public controversies, his political engagement and vision for a spiritual revival through his new book, Born to Be Brave: How to Be Part of America’s Spiritual Comeback.