The enigmatic Voynich Manuscript, a mysterious book that has frustrated codebreakers and linguists for a century, was penned on 15th-century parchment pages, according to U.S. researchers.

据美国研究者称，神秘的伏尼契手稿——令密码破译专家和语言学家头疼了将近一个世纪的奇书，是写于十五世纪的羊皮纸上的。

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"Tony Sale's tribute to the wartime codebreakers is awe-inspiring and we are seeking resources to present the rebuilt Colossus so that generations to come will be able to understand its significance, " he said.

BBC: Colossus

If you finish Singh's code book and want to tax your brain even more, go back to David Kahn's 1, 200-page The Codebreakers, a classic that came out in 1967 and was recently updated.

FORBES: I've got a secret