Science & Technology

In the aftermath of Christmas, a parent could be forgiven for thinking that materialism has trumped human kindness.

Take heart. Children can easily become kinder and more helpful. And that behavior makes them more positive, more accepting and more popular.

At least that's how it worked for fourth- and fifth-graders in Vancouver, Canada. Researchers there have been studying empathy and altruism in schoolchildren for decades.

2012 has been a strange year for content creators — authors, producers, musicians. It was a year when the very idea of physical ownership of a book or CD or even a song file became almost passe.

It was also the year in which music-streaming services like Spotify and Pandora launched major efforts to convince people to pay for something they didn't own. But it's been slow going.

Music-streaming services have been trying to win over two types of customers: a younger generation that doesn't buy at all and an older generation that still likes owning physical albums.

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.

Managing food allergies can be a pain, requiring lots of sleuthing of ingredients in restaurants and supermarkets. But people with potentially lethal allergies to nuts and other foods don't have much choice.

Dozens of smartphone apps offer to make that task easier. Doctors say, though, the apps now on the market just aren't reliable enough.

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.