This book is officially for adults but would also be really interesting to older teenagers. Somehow Alom has, very cleverly, extended a primary school answer to questions such as ‘why is the sky blue?’ into in depth and accurate explanations without ever patronising the reader or leaving them behind. He brings in fascinating background information to scientific discoveries that almost certainly aren’t included in school text books but that will also lead readers to wanting to do more research. Having had a scientific focus during my education (albeit 20 years ago), I thought I’d be nodding along and just appreciating the style, but I definitely learned things I swear I *never* knew! (from TeenLibrarian.co.uk review)