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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!

Iceland is a remote and beautiful island, brimming with volcanoes. Volcanic eruptions give the Earth an almighty shake, so it’s no surprise that Iceland has lots of earthquake measuring seismometers. But you might be surprised to find out what these instruments are picking up.