A survey of the world's most famous unsolved secret codes documents their stories and the monumental efforts that have been applied to their solutions, from the sobering tale of the Zodiac serial killings to the Beale Papers' promise about a lucrative treasure in Virginia's Bedford County. Original.

Follow the horrific crimes of the ZODIAC and see the symbol-filled letters he sent to local San Francisco newspapers. Could breaking his code lead to the arrest of this still-at-large serial killer? Learn how the Declaration of Independence was used to decode part of the BEALE PAPERS. Find the decoder key for the rest of its cipher and a $30 mil...

The greatest unsolved problems that are, or are thought to be, codes or ciphers.

Cryptology has long been employed by governments, militaries, and businesses to protect private communications. This anthology provides readers with a revealing look into the world of cryptology. The techniques used to disguise messages are explained, as well as the methods used to crack the codes and ciphers of encrypted messages. Readers will discover how cutting edge forensic science reveals the clues in the tiniest bits of evidence. A fact versus fiction section helps keep concepts rooted in known truths.

Martin Gardner's Mathematical Games columns in Scientific American inspired and entertained several generations of mathematicians and scientists. Gardner in his crystal-clear prose illuminated corners of mathematics, especially recreational mathematics, that most people had no idea existed. His playful spirit and inquisitive nature invite the reader into an exploration of beautiful mathematical ideas along with him. These columns were both a revelation and a gift when he wrote them; no one--before Gardner--had written about mathematics like this. They continue to be a marvel. This volume was originally published in 1989 and contains columns from published 1976-1978. This 1997 MAA edition contains three new columns written specifically for this volume including the resurrection of the lamented Dr. Matrix.

"In 1953, a man was found dead from cyanide poisoning near the Philadelphia airport with a picture of a Nazi aircraft in his wallet. Taped to his abdomen was an enciphered message. In 1912, a book dealer named Wilfrid Voynich came into possession of an illuminated cipher manuscript once belonging to Emperor Rudolf II, who was obsessed with alchemy and the occult. Wartime codebreakers tried--and failed--to unlock the book's secrets, and it remains an enigma to this day. In this lively and entertaining book, Craig Bauer examines these and other vexing ciphers yet to be cracked. Some may reveal the identity of a spy or serial killer, provide the location of buried treasure, or expose a secret society--while others may be elaborate hoaxes. Unsolved! begins by explaining the basics of cryptology, and then explores the history behind an array of unsolved ciphers. It looks at ancient ciphers, ciphers created by artists and composers, ciphers left by killers and victims, Cold War ciphers, and many others. Some are infamous, like the ciphers in the Zodiac letters, while others were created purely as intellectual challenges by figures such as Nobel Prize-winning physicist Richard P. Feynman. Bauer lays out the evidence surrounding each cipher, describes the efforts of geniuses and eccentrics--in some cases both--to decipher it, and invites readers to try their hand at puzzles that have stymied so many others. Unsolved! takes readers from the ancient world to the digital age, providing an amazing tour of many of history's greatest unsolved ciphers"--

This book shares the author's step-by-step search for the honest answers that freed her from the mental slavery of extreme religion and allowed her to find a true happiness.

Uncover the truth about atheism in the book Oliver Sacks calls, "a revelation. . . I don’t think anyone can match the (devastating!) clarity, intensity, and honesty which Dan Barker brings to the journey—faith to reason, childhood to growing up, fantasy to reality, intoxication to sobriety." ADVANCE PRAISE FOR GODLESS “Valuable in the human story are the reflections of intelligent and ethical people who listen to the voice of reason and who allow it to vanquish bigotry and superstition. This book is a classic example.” —CHRISTOPHER HITCHENS author of God is Not Great “The most eloquent witness of internal delusion that I know—a triumphantly smiling refugee from the zany, surreal world of American fundamentalist Protestantism—is Dan Barker.” —RICHARD DAWKINS author of The God Delusion “Godless was a revelation to me. I don’t think anyone can match the (devastating!) clarity, intensity, and honesty which Dan Barker brings to the journey—faith to reason, childhood to growing up, fantasy to reality, intoxication to sobriety.” —OLIVER SACKS authors of Musicophilia In Godless, Barker recounts his journey from evangelical preacher to atheist activist, and along the way explains precisely why it is not only okay to be an atheist, it is something in which to be proud.” —MICHAEL SHERMER publisher of Skeptic Magazine “Godless is a fascinating memoir and a handbook for debunking theism. But most of all, it is a moving testimonial to one man’s emotional and intellectual rigor in acclaiming critical thinking.” —ROBERT SAPOLSKY author of Why Zebras Don’t Get Ulcers

They were born into this world as innocent children. They ended up as merciless killing machines. How to Make a Serial Killer leads the reader on an insightful, scary, and often disturbing investigation into what made these infamous murderers go bad. Is there really a 'demon seed'? Do genes play a role? Was it their family background? How did pe...