Host Meg Wolitzer presents two stories about the nature of time and how it shapes our lives. In Helen Phillips’ “The Knowers,” a woman chooses to learn a vital fact about her future, while her husband does not. Stockard Channing reads this thought-provoking fantasy. In Anita Felicelli’s “Time Invents Us” a chance encounter turns the clock back for an aging artist. It’s read by Kirsten Vangsness.