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Dr. Beth Zeeman says she can spot a case of influenza from 20 paces. It's not like a common cold.

"People think they've had the flu when they've had colds," Zeeman, an emergency room specialist at MetroWest Medical Center in Framingham, Mass., tells Shots. "People use the word 'flu' for everything. But having influenza is really a different thing. It hits you like a ton of bricks."

This is the second of a two-part discussion. Read Part 1.

A third of young adults in this country say they don't identify with any organized religion. NPR's David Greene wanted to understand why, so he met with a group of men and women in their 20s and 30s, all of whom have struggled with the role of faith and religion in their lives.

Maria Peyer and Mike Bixby are one of those couples who just seem made for each other. They hold hands when they sit and talk. They're happy to spend the morning cooking brunch with their children in their home in southern Washington.

Bixby and Peyer have known each other since they were young, but got married only a few years ago.

"It just hadn't been the right time, until it was. God bless Facebook," says Peyer.

"She Facebooked me, and asked if I remembered her, and then it just went from there," Bixby says.