This activity revolves around magnetism, which is a cool phenomenon to see in action. The materials are easy to come by and prepare. The cork might be a little tricky to find around the house, but you just need to use a material that will allow the needle to float. That in itself is a good way to challenge your student. Before starting the lesson, I would suggest having your child read the excerpt “Digging Deeper” in the Explore More tab to provide additional information not mentioned in the introduction. Magnetizing the needle can be hard, so the better magnet you have the better chances of it working well. The refrigerator magnets work well enough, but I recommend getting a ceramic magnet from a hardware store. They are highly affordable and can be used for many different STEM activities.