Codes, Ciphers and Secret Writing (Test Your Code Breaking by Martin Gardner

By Martin Gardner

Scan with cryptography—the technological know-how of mystery writing. Cipher and decipher codes: transposition and polyalphabetical ciphers, well-known codes, typewriter and cellphone codes, codes that use cards, knots, and swizzle sticks...even invisible writing and sending messages via outer area. Hours of intrigue and problem. forty five diagrams.

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Sample text

I do not know,” the Cinrusskin said. “I have no previous experience and there are no recorded instances of the condition among my species. ” Conway asked. “Empathic hypersensitivity,” Prilicla replied. “The emotional radiation of yourself, the rest of the medical team, and the crew is particularly strong. I can clearly detect the feelings of Lieutenant Chen in the Power Room and those of the rest of the crew in Control with little or no attenuation with distance. The expected, low-key feelings of disappointment and sorrow caused by the unsuccessful rescue bid are reaching me with shocking intensity.

Aloud he said, “The process of reflecting and magnifying the feelings, hostile or otherwise, of the people around them is a defense mechanism which would, naturally, be at its most effective when the being is helpless, vulnerable, or unconscious. With a return to consciousness the effect seems to diminish but the empathic reflections are still strong. The result is that everyone around them will have an empathic faculty not unlike Prilicla’s, and yet the EGCLs are deaf to each other’s emotional radiation because they are transmitters only.

The planetary—“Fletcher began, then went on, “We haven’t undocked yet, much less reached Jump distance, and you’re worrying about landing on Cinruss! Are you sure you know what—” “I’m not sure of anything, Captain,” Conway said. ” Fletcher broke the connection without replying, and a few seconds later the direct vision port showed the vast metal flank of the hospital moving away. Their velocity increased to the maximum allowed in the vicinity of the establishment, until the nearest section of the gigantic structure was a kilometer, then two kilometers away.

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