In this book Emily's Aunty Jane helps Mark and Emily figure out why hot air rises. They also learn how to identify good science and start thinking about evaluating sources of knowledge.The focus is that they aren't accepting information blindly, but rather investigating the question for themselves to come up with the right answer. In this way, they are able to answer the question "How do you know?" and laying the foundation for using the scientific method as a reliable pathway to knowledge.
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