Why do some people sleepwalk?

26 September 2014
Presented by Chris Smith, Redi Tlhabi.

How is sea-level defined? What makes some people sleepwalk? How are barometers calibrated? What is an acquired taste? How much of the body is water? Do we really use only 10% of our brain? Why does red wine stain your lips? Why to I talk in my sleep? What happens if you drink petrol?

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