It's quite an old book, it's not being printed anymore, and the most expensive copy on Amazon is going for £234.99. Much cheaper versions are available, but I was extremely lucky to get mine for £6 from a second hand bookshop,
The book uses other famous stories (including JRR Tolkien, C.S Lewis and Anne McCaffrey) to scientifically prove all the information you would ever need to know about dragons.
It explains how dragons breathe fire, and how that helps them to fly.
It explains how Dragon's blood is made of acid (which must be why it makes such good oven cleaner).
And most importantly, it explains how dragons can communicate with other creatures through eye contact.