''Nuclear War''... Best-selling author and Pulitzer finalist Annie Jacobsen paints a frightening picture of how real the threat is and how close we've come to the unthinkable (at 13:56) --- With diminishing cognitive ability being a topic on everyone's mind lately, ''The Better Brain Solution'' outlines a lifestyle plan to sharpen mental function and prevent memory loss (at 22:16) --- Throwback Thursday: Reflections on a legendary musical career with Richard Sterban, who has been the most distinctive voice of The Oak Ridge Boys for a half-century (at 45:38)