When the news is filled with war and climate change and other disasters, remaining hopeful about the future can feel impossible. But psychologists’ research has found that hope is not an unrealistic luxury, but a necessity. Jacqueline Mattis, PhD, of Rutgers University, and Chan Hellman, PhD, of the University of Oklahoma, discuss the difference between hope and optimism, why cultivating hope can help people facing adversity and trauma, and what all of us can do to find hope in trying and uncertain times.   For transcripts, links and more information, please visit the Speaking of Psychology Homepage.