07:15The Science of DIYEpisode 2: A Chip off the Old BlockBBC Radio 4 Extra Duration: 15 minutes Sun 26th May 2013, 07:15 on BBC Radio 4 ExtraThe art of construction deconstructed. Len Fisher and fellow experts reveal how to sharpen and use your tools properly.GenresFactualScience & NatureSeriesThe Science of DIY Source: BBC Online