14:15The Invention of ChildhoodThe Nation's Most Important AssetBBC Radio 4 Extra Duration: 15 minutes Tue 10th Dec 2013, 14:15 on BBC Radio 4 ExtraMichael Morpurgo presents readings of the words of children about the effect of the wars of the 20th century.GenresFactualHistorySeriesThe Invention of Childhood Source: BBC Online