We put raisins in water and let them sit overnight. And the raisins turned from tiny, small and sticky to seed size and were hard and not sticky. They were bigger than they were before. It happened from osmosis. I liked this experiment. I hope you do too! I am Joshua. 
Before After
(Experiment found in Janice VanCleave’s Biology for Every Kid: 101 Easy Experiments that Really Work.)
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