Episode details

Available for over a year
DR KARL discusses whether human saliva is a good cleaning agent? Also, are perpetual motion vehicles a realistic possibility and is thorium a cleaner alternative to nuclear power?
Programme WebsiteUse BBC.com or the new BBC App to listen to BBC podcasts, Radio 4 and the World Service outside the UK.

Available for over a year
DR KARL discusses whether human saliva is a good cleaning agent? Also, are perpetual motion vehicles a realistic possibility and is thorium a cleaner alternative to nuclear power?
Programme Website