Why do we get nightmares?

Are there extra types of water? Where is belly-button fluff from? What causes nightmares?
18 July 2014
Presented by Chris Smith, Redi Tlhabi

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Are there extra types of water? Do plants give off carbon dioxide at night? Why does huddling together keep you warm? What is the origin of belly-button fluff? What causes nightmares? And how does the magnetic field around Earth affect us? Plus, news of how dental plaque can show us what our ancestors ate...

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