A round-up of noteworthy articles in the print edition of December 23rd 2006 - January 6th 2007. A second selection, of longer articles, from the Christmas double issue. In this week's podcast: the art of conversation; assisted reproduction; Britain's tabloid press; and American country music....

A round-up of noteworthy articles in the print edition of December 23rd 2006 - January 6th 2007. In this week's podcast: happiness and how to measure it; the Google model for corporate software; the soaring cost of rare violins; and the death of free will....