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Combine milk, washing-up liquid and food colouring for this amazing effect... Add a layer of milk, then add drops of food colouring in different spots around the centre. Add one drop of washing-up liquid into the centre of the mixture OR (as in this video) prod the centre with a cotton bud with washing-up liquid on the end. [From @GE via @SarahBearchell] The science behind it is explained here:

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Cuisenaire rods - something went horribly wrong for me with Maths after this stage...

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Learning with Elmer by David McKee

Learning with Elmer - activities include baking Elmer biscuits, patchwork Lego boards and Elmer fridge magnets.

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Mandelbrot Fractals: Hunting the Hidden Dimension

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Can the minecraft paper making process be used for explaining negative exponents? Check out this post at Christy's Houseful of Chaos.