Claire Miller

The Don Drapers of the world used to marry their secretaries. Now they marry fellow executives, who could very well earn more than they do. With more marriages of equals, reflecting deep changes in American families and society at large, the country is becoming more segregated by class.

On Christmas Day in the United States, Americans wake up around 7:35 a.m. on average. They might be envious of Brazilians, who have languid Christmas mornings and whose average wake-up time is 9:09 a.m. The Japanese, meanwhile, wake at 6:43 a.m., about the same time as every other day.

In a move with little precedent in professional sports, the NBA is putting the weight of its multibillion-dollar brand and the prestige of its star athletes behind a series of television commercials calling for an end to gun violence.

A range of startups and big companies like Google are working on what is known as predictive search -- new tools that act as robotic personal assistants, anticipating what you need before you ask for it.

Less than two years after Steve Jobs' death, Laurene Powell Jobs is becoming somewhat less private. She has tiptoed into the public sphere, pushing her agenda in education as well as global conservation, nutrition and immigration policy.