Magnetic marble run for your fridge door - fun science project for kids2972 Measuring height with Magna-Tiles is a fun way to explore math and measurement at home2873 Catapult STEM - how to make DIY craft stick catapults2842 DIY Pulley for the loungeroom stairs2145 Magnatile play for preschoolers1574 STEM Challenge. Building 3D structures.1303