Alok Jha is joined by Guardian science correspondent Ian Sample and environment site editor Adam Vaughan to ponder the slow start to the badger cull in the UK and ask whether it's likely to achieve its goal of reducing the incidence of bovine TB.
They also discuss Sir Martin Rees's plea for science to come up with a plan B to tackle climate change using geoengineering, and the Voyager 1 probe.
Also on this week's show, we report from the British Science Festival in Newcastle where the inaugural Huxley debate took place. Alok interviewed the protagonists, Prof Tim Spector and Prof George Davey Smyth, who debated the emerging study of epigenetics – changes in gene expression during one generation that may be inherited by the next. Has the whole field been overblown?
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