I love the "See Inside..." series, as do my little boys. I recently purchased this book and popped it secretly onto the bookshelf and when they spotted it they were so thrilled!
As with all of the other books in this series, the many, many illustrations are colourful, fun and very informative. They instantly draw the child in and then, of course, they can lift all the flaps, (over 90 of them), to get further information. The contents of this book are: Simple machines; Movers & shakers; Getting going; Making music; Waterworks; Floating & flying; Everyday inventions; Up, down & around and Bits & Pieces. Just on the first page in "Simple machines" the child learns, (with very helpful illustrations), about wheels, cogs, pulleys and levers...to name but a few things. There's a good chance that this book may well teach parents a couple of things that they don't know, or have forgotten. You do all remember what a fulcrum is, don't you?!
Most of the information is very relevant to our everyday lives and will have children wanting to know more and more. The section on waterworks, for example, shows the basics of how toilets work, (amongst lots of other stuff). Our boys were instantly off to the toilet wanting to look inside the cistern and see it happening for real!
I would say that these books are great for children from 4 years upwards, (perhaps younger if your child is very into this sort of stuff), if parents are happy to sit down and read them together. The language used in the book means that confident readers from 6/7 years up should be able to manage this without too much bother, although of course the nature of the subject means that terms such as "hydraulic" crop up in there!
Overall I can't recommend this book highly enough for any child that is inquisitive about the machines and inventions around us. If you think that they might enjoy learning about how lightbulbs work, how planes fly or how toilets flush then this is definitely for them!!