1. Introduction -- 2. From Julius Caesar to simple substitution -- 3. Polyalphabetic systems -- 4. Jigsaw ciphers -- 5. Two-letter ciphers -- 6. Codes -- 7. Ciphers for spies -- 8. Producing random ...
Digital media use—mobile phone, computer, internet, and social media—at nighttime or near bedtime is associated with shorter sleep duration and poorer sleep quality, and it can be especially damaging ...
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