Lip Service

Smile, and the whole world smiles with you. But they don't all necessarily mean the same thing. Marianne LaFrance convinces us there's a secret wealth concealed behind that most common of facial expressions. Drawing from the allied fields of medicine, biology, psychology and anthropology, with a dash of computer science, LaFrance dissects the smile into its component parts and reassembles them into a potent force for both transparency and chicanery, friendship and enmity.

April 19: "What you see first, after the starting gun's crack, is a column of bobbing runners, thousands of them, surging downhill..."

Donna Tartt's The Goldfinch is the winner of the 2014 Pulitzer Prize for Fiction. James Parker calls this Dickensian coming-of-age novel "an enveloping…