Each group needs:

• 480 ml (1 cup) cereal with a high iron content, such as Total® or any cereal that contains 100% of the recommended daily allowance of iron

To share with the entire class:

• magnets of varying strengths, such as magnets generally used in classrooms; refrigerator magnets have less strength and may not work, but provide students with an alternative with which to experiment
• Ziploc® bags
• cups of water
• blender
• electronic balance that is sensitive enough to be able to detect small changes in weight (at least one tenth of a gram); if not available, see the Procedure section for alternative ways to quantify the amount of cereal removed