Research scientists frequently face the challenge of examining an object or organism without taking it apart. As your students first pull the cord on 1 end and the other end pulls into the tube, they may think the solution is easy. As they continue their investigation, they will be challenged to describe a model for the inner workings of the Mystery Tube© and provide supporting evidence to defend their hypothesis. The solution is not provided. Scientists must continue to design experiments and revise their mental model based on their findings.