Nuclear scientist Dr Sue Ion visits the Alternative Technology Centre in Hebden Bridge to discuss nuclear power.
Cloning expert Prof Stephen Minger joins the congregation at St Mary's Church in Elham, Kent, to discuss the creation of embryos that are part cow, part human.
Former chief scientific officer to the government Sir David King visits the Magic Cafe in Oxford to discuss GM agriculture.
Immunisation coordinator Dr David Elliman joins parents at Rosenedale primary school in south London to discuss the MMR vaccine.
Professor Tony Ryan from Sheffield University spends his lunch hour talking to people in the Winter Gardens in Sheffield about nanotechnology.