Science Buddies: "Ask an Expert"

Hi I did a science project last year on planaria regeneration. I was so fascinated by it. I would like to continue to work on a similar project. I'm thinking to use magnets and see the effects of magnetism on their growth. However not sure what kind, and where to get these magnets. How am I supposed to place them in a petri dish? And how to measure/know the strength of a magnet? I also struggled to measure the Planaria. is there a specific microscope I need to use? Thank you

Moderator note: Science Buddies project: https://www.sciencebuddies.org/science- ... generation

Neodymium magnets like N35 or N52, or even standard ceramic ones, work best for this. Their strength is usually rated in Gauss or Tesla by the seller, but for a school project you can easily compare their relative strength using free magnetometer apps like Phyphox or Physics Toolbox, or just by seeing how many paperclips each one can hold.
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