AC Grayling discusses mental illness and violence with Psychotherapist Gwen Adshead.
BBC World Service
Lionel Kelleway heads into Devon to explore the delights of an autumnal hedgerow.
BBC Radio 4
AC Grayling discusses String Theory with physicist Brian Greene.
Helen Mark hears how a forest of ten million conifers changed Ayrshire's Whitelee Plateau.
28/40 Saving Species witnesses the extraordinary mating behaviour of Koalas in Australia.
Of the 6500 wasp and bee species in the UK, only one can make a clay pot: the potter wasp.
AC Grayling discusses malaria with expert Kevin Marsh on how to beat the disease.
Owen Sheers explores Wales' secret military history from World War II.
27/40 Saving Species visits Islay in Scotland in the company of twenty five thousand geese.
Alex James is in Kent to visit one of the country's biggest orchards.
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