What is Sleep Walking?

10 May 2013
Presented by Chris Smith, Redi Tlhabi


Injecting heroin intravenously


Does cold exposure cause colds? What consitutes safe drinking water? Why do distant lights and stars flicker? What is sleep walking? What causes bipolar disorder? How does sound travel in air? Plus, news of a vaccine to help crack heroin addiction. Join Dr Chris for more top science questions from South Africa...


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