Why do banana peels go brown?

Do dogs in different countries understand each other? Why do banana skins go black?
28 November 2014
Presented by Chris Smith, Redi Tlhabi

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Bananas

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Can you feel two pains at the same time? How can bottled water freeze instantly? Can a migrant dog understand his new neighbours? What is the pith inside an orange? Does eating the in-flight meal alter an aeroplane's weight? Why do skins of bananas blacken faster after you peel them?

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