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The shooting in Newtown, Conn., is likely to have an impact on many children, even those nowhere near the state. Host Guy Raz is joined by NPR's Jon Hamilton to talk about how parents, teachers and others who spend time with kids should prepare to discuss the event.

Carmakers are taking advantage of innovations in electronics and software to trick out the interiors of their vehicles. The gizmos appeal to tech-savvy buyers. But those interior features are quietly aimed at another audience: aging baby boomers.

The preservative thimerosal keeps vaccines from going bad in places where there is no refrigeration. Anti-vaccine activists say it should be banned because it contains mercury, but public health officials insist it's safe.

Also: Blast kills young girls in Afghanistan; Egypt's draft constitution gets support in first stage of voting; Sen. John Kerry expected to be tapped for secretary of state.

Languages. Aired Dec. 17, 2012.

Native Gecko. Aired Dec. 19, 2012.

Children in third through sixth grade consume more calories when snacking on potato chips, and fewer when they snack instead on raw broccoli, peppers, carrots and cheese combinations, according to a recent study. This adds to evidence that foods high in fiber and protein help us feel fuller.

No Wetlands. Aired Dec. 20, 2012.

Many say Dec. 21, 2012, is the day ancient Mayans prophesized the world would end, but scholars say that is not what the calendar said. The day is the end of a cycle in Mayan life, but not the end of the world.

After a 1996 mass shooting, the country changed its gun laws and the government bought back roughly 20 percent of all guns. Since then, gun violence has been down, and there have not been any mass killings.