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First graders generally love to think concretely. So if it's a rock, it's heavy. If it's a little box of raisins, it's light. Right? Well, not always…and this discovery is often mind-boggling for little kids. It's also very important as they build their science understanding; in later grades kids will actually study formal scientific concepts of volume, mass, and measurement. Here's a fun activity to help build thinking skills in young scientists and to encourage them to have a blast exploring the world in new ways.