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"Back in primary school I remember learning about the internals of the human body by constructing a digestive system out of toilet rolls. Needless to say, that summer I probably used more toilet tissue than I needed too in an effort to get enough toilet rolls together. The results were awesome though. I plonked a marble through the cardboard oesophagus and proudly demonstrated to my parents the wonders of the human digestive system. I'm assuming my model had the equivalent of the runs as my marble got through in about 5 seconds. Now, the days of such eco-unfriendly learning are behind us and Zybright have released a great app called My Incredible Body, which I would say is aimed at ages 4-13."