What causes Deja vu?

10 February 2012
Presented by Chris Smith, Redi Tlhabi.

What is freezing rain, do cats control their owners, how do accents arise, why does hair go grey, what is the origin of deja vu, why did my glass table spontaneously explode and is the world population becoming more or less genetically diverse? Dr Chris tackles this week's round up of the best science questions from South Africa....

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