At its core, demography is the act of counting people. But it’s also important to study the forces that are driving population change, and measure how these changes have an impact on people’s lives. For example, how does immigration affect U.S. population growth? Do Americans feel that children are better off with a parent at home, in an era when most women work? How is the rise of the young-adult Millennial generation contributing to the rise of Americans with no stated religion? For this year’s Population Association of America (PAA) annual meeting, here is a roundup of some of Pew Research Center’s recent demography-related findings that tell us how America and the world are changing.