Step 1: Put your baking soda, Epsom salt and citric acid into a bowl. Mix together.
Step 2: In a separate bowl, add a couple of drops of natural food colouring, half a teaspoon of water, 1.5 teaspoons of olive oil, and a teaspoon of natural essential oil. Mix together.
Step 3: Repeat Step 2, choosing a different colour. We used three colours for ours, so completed Step 2 three times.
Step 4: Pour your wet ingredients into the dry ones. You must do this slowly to ensure you don’t activate the citric acid. Keep stirring in the liquid a splash at a time.
Step 5: When the mixture gets crumbly, knead it with your hands. This feels great!
Step 6: Add your mixture to the moulds, ensuring it’s tightly packed in. Push the moulds together and remove any excess mixture. Place them in the fridge for up to three hours (until your bath bomb hardens). You can either mix different colours to make a rainbow bath bomb or create separate colours (or both!).
Step 7: Take out of the fridge, remove the mould, and enjoy! Fizzzzzzz!

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Somewhere beneath a grassy field right now, a tiny insect is building an underground loudspeaker. Male mole crickets engineer horn-shaped burrows that amplify their calls hundreds of metres into the night air – and your child can recreate the same science at home using nothing but cardboard and a phone. This hands-on experiment explores sound, shape and natural engineering in a way that is genuinely surprising. No screens, no special equipment, just a brilliant idea borrowed from nature.
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