Apr. 5 & 12. Popular series of talks, aimed at general audiences, by U-M scholars. Apr. 5: U-M chemistry professor Theodore Goodson III on “Organic Optical Materials: From Solar Cells to Light-Emitting Diodes.” Apr. 12: U-M physics grad students discuss their cutting-edge research on dark matter, dark energy, and materials. 10:30 a.m., Weiser Hall, rm. 170, 500 Church. Free. (734) 764–4437.