Science & Environment

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ROBERT SIEGEL, HOST:

Now to a scientist looking back at the year that's about to end, commentator Adam Frank is an astrophysicist. And in the category of science, he is confident about the headline for 2012.

ADAM FRANK: Something remarkable has happened that may etch this year into history for centuries to come. Twenty-twelve's importance comes not through elections, economic shifts or the new movements in art. No, 2012 may well be remembered for something far more elemental.

This was the year that climate change got real for Americans.

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ROBERT SIEGEL, HOST:

Bad winter weather is making life difficult for hundreds of thousands of holiday travelers. Yesterday and today, much of the middle and eastern half of the U.S. was hit with blizzard-like conditions. As NPR's Pam Fessler reports, the storm's next stop is New England.

PAM FESSLER, BYLINE: The band of nasty weather has been working its way up from the South, where on Christmas Day residents of Texas, Louisiana, Mississippi and Alabama got a rare and destructive surprise.

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It's been a mixed year for Alzheimer's research. Some promising drugs failed to stop or even slow the disease. But researchers also found reasons to think that treatments can work if they just start sooner.

Scientists who study Alzheimer's say they aren't discouraged by the drug failures. "I actually think it was a phenomenal year for research," says Bill Rebeck, a brain scientist at Georgetown University.

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.