Baystate Health's Dr. Stuart Anfang discusses seasonal affective disorder & ways to treat SAD. Big Brothers Big Sisters Executive Director David Beturne & mentor Dr. Murdoc Khaleghi reflect on the organization's 50 years of connecting Hampden County children with adult mentors. UMass Amherst biologist Dr. Jeffery Blanchard sheds light on the 16 giant viruses found in a Petersham forest.