22:30Down the LineSeries 3Episode 2: String Theory and Popular Science FictionBBC Radio 4 Extra Duration: 30 minutes Sun 12th Mar 2017, 22:30 on BBC Radio 4 ExtraGary Bellamy tries to raise the bar on his phone-in show with a chat about string theory. Stars Rhys Thomas. From January 2008.GenresComedySpoofBrandDown the LineSeriesDown the Line: Series 3 Source: BBC Online