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Observation is an important part of science and yet it is seldom taught in science courses. Many examples of poor science arise because people honestly report what they see, and yet their reports are flawed because they do not understand how their visual system can be fooled. Understanding perception is necessary to help us understand how there can be so many incorrect pseudo-scientific reports in the media. **Note: Any model that has a 'FIRST TO TRY' icon is in the experimental printing stage. This means that ordering this model will send it into the "FIRST" test for 3D printing for your chosen material. There can be instances where the model must be updated in order to complete the 3D printing process. If this is the case, you will be notified that your order was canceled and must be placed again. This occurs to allow you to re-approve the updated version of the chosen model before being charged for anything.**