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There only a few projects in this book. It's a good test for seeing if your kids want to continue this type of making without investing a whole bunch of money. More experienced makers are going to want to find another book.
This is a clever, well-conceived, well-executed book for curious young minds prepared by science-loving science nerds. I always say, if you want to learn something, find someone who loves it and ask them to mentor you. This book is just such a meeting of the minds and hearts.
Everything from the full-color graphics to the comic-books type layout, to the font says "Science is fun!!" Some projects will be easy to pull together with things you have on hand; many require purchasing some (usually inexpensive) details (like an LED light or some wire on a spool) to complete them. Don't be cowed by the need to go to the hardware store - honestly, such a trip is an education in and of itself, and you should do it often to help nurture science loving kids. Plus, it will likely introduce you to other science-loving prospective mentors, and just looking at the rows and rows of materials is fodder for creative minds to get thrilled about.
Apart from being creative and expansive, this book is also quite forward thinking in that the characters depicted are old, young, light, dark, boy, girl, shaggy-, kinky-, or straight-haired, etc. The subliminal is that "science is for everyone" and it's not unlikely that your kids will identify with the characters shown taking part in the projects.
This book is also very practical and anticipates likely flubs or misstarts; there is often a section in a given project that troubleshoots reasons why you might not have had the expected results, or warns of this or that thing that might go wrong.
The projects are fun and interesting, and the explanations help the user understand how it's relevant in the real world.
As you can see, I love this book, and will look for others in the series. It is recommended by the publisher for ages 8-12, but I would think that mechanically minded kids might get into it earlier (with additional adult help/supervision) and will certainly enjoy such projects even beyond the age of 12. In our home we'll probably have a 17 year old boy coaching his 11 and 13yo sisters in the projects.
The only reason I docked one star is that it was not packaged well, and came with a spine crimped in two places, making it difficult to gift with confidence. If it had been shipped securely I would have given it 5 stars.