08:50Call Kaye01/11/2011BBC Radio Scotland Duration: 1 hour, 40 minutes Tue 1st Nov 2011, 08:50 on BBC Radio Scotland Highlands and IslandsThe world's population is now seven billion. Kaye asks: should we stop when we get two kids? And did you open your door for Halloween? Plus who was your best teacher?GenresFactualNewsBrandCall Kaye Source: BBC Online