Why your coffee makes a weird sound The Hot Chocolate Effect

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Make some instant coffee, give it a stir then tap the rim of the mug. You'll notice a steady rising in pitch. • Listen to our Domestic Science radio show here: • http://festivalofthespokennerd.com/tv... • Visit my blog here: http://stevemould.com • Follow me on twitter here:   / moulds   • Buy nerdy maths things here: http://mathsgear.co.uk

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