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Those of us trying to lose some pounds after overindulging this holiday season can get help from a slew of smartphone apps that count steps climbed and calories burned. Self-tracking has also become a way for companies to make money using your fitness data. And some experts worry that the data collected could be used against users in the long run.

At a recent Quantified Self Meetup in downtown San Francisco, technology lovers are testing homemade do-it-yourself devices on people eager to measure their mind and body.

Now that the Christmas feast is over, you may be looking at all the extra food you made, or the food that you brought home from the store that never even got opened.

And you may be wondering: How long can I keep this? What if it's past its expiration date? Who even comes up with those dates on food, anyway, and what do they mean?

Here's the short answer: Those "sell by" dates are there to protect the reputation of the food. They have very little to do with food safety. If you're worried whether food is still OK to eat, just smell it.

When we asked listeners to tell us what they ate on Christmas Day, we found a lot of commonality — puddings, cookies, egg nog — and a few quirks, including a drink called a "Holiday Harvey," and an odd Christmas Day sandwich made of biscuits, salami, cookies, and butter.

Rudolph is of course known as the red-nosed reindeer, and scientists say they may know why that's the case.

Hear the word "prophet" and the names Jeremiah, Isaiah, Ezekiel, Jesus or Mohammed may come to mind. While these are figures from the distant past, Rabbi Shmuel Fortman Hapartzi is training a new generation of prophets for a new age.

Fortman runs the Cain and Abel School for Prophets in Tel Aviv. It's named for the sons of Adam and Eve who, in the Bible, were the first human beings born of woman to speak directly to God and therefore, Fortman says, the first prophets.

Rita Betush and Judy Bottomley grew up with a sense that something was missing. As a child, Betush's mother told her she had a sister who'd been put up for adoption. This year, after decades apart, Betush and her long-lost sister, Bottomley, connected by phone, and in February, they'll finally meet.

The Christmas season is a peculiar time for Jewish children, many of whom are drawn to Christmas specials like A Christmas Story. What should Jewish parents do? Guest host John Donvan talks to Slate senior editor Dahlia Lithwick about her Jewish parent's guide to Christmas specials.

Guest host John Donvan reads listener comments from past shows about witnessing tragic events, adoption in the Internet age and how to fill time while you wait.

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DAVID GREENE, HOST:

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DAVID GREENE, HOST:

Thousands of Christian pilgrims streamed into Bethlehem Monday night to celebrate the birth of Jesus. It's the major event of the year in that West Bank town. But Israeli archaeologists now say there is strong evidence that Christ was born in a different Bethlehem, a small village in the Galilee.

Throughout the debate over taxes and the "fiscal cliff," there's been a lot of looking backward — to the 1990s. The economic expansion of the 1990s was the longest in recorded American history.

Democrats say the economy thrived under the leadership of President Bill Clinton, including his tax rate increase on high earners. Republicans say government didn't spend as much then and that growth didn't really take off until the GOP took control of Congress in 1995.

So what actually happened in the '90s? What made them tick?

A Unique Boom

Although President Obama supports setting a path to citizenship for many illegal immigrants, his administration deported a record 1.5 million of them in his first term.

In addition, the latest data released by the government in recent days show that an unprecedented 409,849 people were deported for the fiscal year that ended Sept. 30.

The increase from the previous year occurred despite policy changes ordered by Obama to reduce the deportations of otherwise law-abiding illegal immigrants.

To celebrate Christmas, Fresh Air listens back to a concert given by the late singer and actress on Feb. 11, 1997. Clooney spoke then with Terry Gross about her childhood, being on the road as a young performer with her sister, and working with Bing Crosby and Billy Strayhorn.