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Rulers are great at measuring straight lines, but how do you measure a curvy line? Here’s one way, using a wonderfully messy diagram!

NASA’s Ingenuity helicopter has made history by flying on Mars. To celebrate the first flight of a copter on another planet, here’s a simple unpowered helicopter you can build at home!

Do you like to prank your friends and family? Give this little contraption a go. It’s the perfect thing to make someone jump, without causing any harm.