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Harness a powerful simple machine to launch some tasty treats. Safety: When dealing with food, use clean hands and clean equipment. Be careful with your catapult and make sure no one is standing where you’re aiming it.

This cardboard doll loves to leap! It takes a bit of crafting, but the results will make you jump for joy.

What’s the faintest touch you can feel? A feather on the back of your hand, a whispered breath in your ear? Scientists from CSIRO and Griffith University just built a device that feels much lighter touches – in fact, it’s the most sensitive force detector on the planet!