Why some sentences have double subjects. The story behind the old F-like letter S. Schwen schwen on dill.

987. This week, we look at why people sometimes double their subjects, writing sentences such as "John, he bought a car," and when it's OK (and not OK) to do so. Plus, we talk about the medial S, a strange F-like letter that makes an S-sound and shows up in old documents. We look at how it came to be, its role in English typography, and what made it finally go away.