| http://www.w3.org/ns/prov#value | - What makes this book particularly cool is not just the way that science and experimentation and engineering are brought into the story (the kids build things to help them solve the mystery) but that the step-by-step schematic plans and drawings for all of the experiments and devices are written right into the book itself. (Note to self: my son wants to build his own electromagnet now).
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