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This year’s National Science Week theme is ‘Food: Different by Design’. So let’s celebrate with some edible marshmallow slime! Safety: When handling food, use clean hands and clean equipment. Items from the microwave can be hot – ask an adult to help.

Have you ever wondered why there are gaps in footpaths, and at the ends of bridges? Bridges, footpaths and many other structures get bigger when they heat up, and they need gaps so they don’t break on hot days. But Australian scientists have discovered a material that stays the same size over a wide range…