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==Teens==
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{{newreview
|author=Gary Blackwood
|title=Mysterious Messages - A History of Codes and Ciphers
|rating=5
|genre=Children's Non-Fiction
|summary=There's something utterly cool about codes and ciphers. It's not just the spies with their secret world, it's the mystery of an ostensibly random set of letters or pictures. It's being able to unravel them and see what they're hiding. It's a combination of geeky riddle solving (and geeks are cool, so there) and uncovering the unknown meanings. Gary Blackwood treats us to a history of codes and ciphers, looking at their creation, the stories behind them, and how to crack them.
|amazonuk=<amazonuk>0525479600</amazonuk>
}}
{{newreview
|author=Marie-Louise Jensen