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Many famous scientific discoveries have been made when an experimenter noticed something unusual or a mistake and followed up on the serendipitous discrepancy rather than ignoring it as others had done. This free activity serves as an engaging introduction to significant digits and the need for careful measurements as a means of making interesting discoveries. This approach stands in contrast to skills-only labs where students practice for future, potentially more interesting uses. Finally, the activity is one of many that can be used to convince students that the atomic and kinetic molecular theory really is a sensible (i.e., its effects can be experienced through the senses and are logical) and powerful explanatory and predictive model for a wide variety of macroscopic events. This free selection includes the Table of Contents, Introduction, a Science Education Topics section, and the Index.