NPR reporter David Kestenbaum tells Ira about the time, when he was doing graduate work in physics, he and his other single friends decided to figure out the mathematical probability that they’d find girlfriends. They wanted to know what the chances were that there was more than one person in the world for them. When you’re in love, it always feels like it was meant to be, whether or not it really, statistically speaking, is. (6 1/2 minutes) Science