Tuesdays, June 14 & 21, 2022 at 11 p.m. on KPBS TV + Wednesdays, June 15 & 22 at 11 p.m. on KPBS 2 / On demand with PBS Video App. Explore the evolution in understanding, and the dramatic attempts across generations to unravel the difficult questions surrounding mental illness people have grappled with throughout history: What causes it? And how is it best treated?