A computer program that reads human expressions may bring an about-face in marketing.

Dutch researchers using the software recently for a consumer test project seconded what wise men have always known: Sweets are the surest way to make a woman smile.

Some 300 women in six European countries were filmed as they ate five foods: vanilla ice cream, chocolate, cereal bars, yogurt and apples. Not surprisingly, ice cream and chocolate produced the most happy expressions across the Old Continent. More at Wired.