I've always been a fan of putting them in little toothpick cages... they ooze between the bars as they grow, and the cage frequently breaks...
or putting two of them on a paper plate (you seriously don't want to clean up after this) with a toothpick "sword" in each one and let them battle...
Kids love it, it's all in the name of science... you should see what you can do with grapes in the microwave!






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