'Do you think you can fit through this index card?' My daughter looked at me like I was crazy as I asked her this question and held up a 3x5 index card. She emphatically answered no, and was very curious when I told her that I could show her how she could very easily fit through an index card. What followed was one our favorite science experiments for kids as we learned how to make an index card chain. Why this experiment is fun for kids With this science experiment, kids will learn about how physical objects change. As a bonus,