Black Women, Solar Flares, Study Retraction

A recent book shines a light on stories of ingenuity and activism among black women fighting for their rights as Americans. Also, how a solar flare that reaches Earth could catastrophically wipe out our technology. Then, why so many scientific studies get retracted. Also on today's show: the Air Force is developing laser weapons, the Dream Lab at MIT that hopes to harness the creative power of sleep, and how scientists are growing lettuce in space.