An old complaint about the safety of childhood vaccines is finding new life at the United Nations.
The U.N. Environment Program is considering a ban on thimerosal, a vaccine preservative that is widely used in developing countries. The program expects to make a decision sometime after a final meeting on the issue in January.
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.