Books about Unsolved from Amazon.com

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Price: $12.45 [Notify me when price goes down.]

Bernhard Riemann was an underdog of sorts, a malnourished son of a parson who grew up to be the author of one of mathematics' greatest problems In Prime Obsession, John Derbyshire deals brilliantly with both Riemann's life and that problem: proof of the conjecture, "All non-trivial zeros of the zeta function have real part one-half." Though the statement itself passes as nonsense to anyone but a mathematician, Derbyshire walks readers through the decades of reasoning that led to the Riemann Hypothesis in such a way as to clear it up perfectly. Riemann himself never proved the statement, and it remains unsolved to this day. Prime Obsession offers alternating chapters of step-by-step math and a history of 19th-century European intellectual life, letting readers take a breather between chunks of well-written information. Derbyshire's style is accessible but not dumbed-down, thorough but not heavy-handed. This is among the best popular treatments of an obscure mathematical idea, inviting readers to explore the theory without insisting on page after page of formulae.

In 2000, the Clay Mathematics Institute offered a one-million-dollar prize to anyone who could prove the Riemann Hypothesis, but luminaries like David Hilbert, G.H. Hardy, Alan Turing, André Weil, and Freeman Dyson have all tried before. Will the Riemann Hypothesis ever be proved? "One day we shall know," writes Derbyshire, and he makes the effort seem very worthwhile. --Therese Littleton.
Price: $9.02 [Notify me when price goes down.]

Is Social Security really going bust, and what does that mean to me? If I hire an immigrant, am I hurting a native-born worker? How much can presidents really affect economic outcomes? Why does the stock market go up when employment declines? What's a "living wage?" Why do I feel so squeezed?

If you'd like to know the answers to these questions, premier economist Jared Bernstein is here to help. In "Crunch" he answers these as well as dozens of others he has fielded from working Americans by email, on blogs, and at events where he speaks. Chances are if there's a stumper you've always wanted to ask an economist, it's solved in this book..
Price: $16.25 [Notify me when price goes down.]

The Mary Celeste was discovered adrift on the open sea by another ship in 1872 -- with no sign of captain or crew. What happened? Did the crew mutiny? Were they attacked by pirates? Caught in a storm? No one ever found out.

Inside this book are the clues that were left behind and the theories of what people think happened aboard that ship. Become a detective, study the clues, and see if you can help solve this chilling mystery from history.

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Price: $3.26 [Notify me when price goes down.]

In 1587 John White was chosen by Sir Walter Raleigh to lead a new colony at Roanoke off the Atlantic coast. After bringing many men, women, and children to the new land, White went back to England to gather supplies for the long winter. But when he finally returned to the fort almost three years later, he found that all of the colonists had vanished. The only signs of life left were the letters CRO carved into a tree and the word CROATOAN carved into one of the fort's posts. Some people think that the Spanish army captured the colonists; some people think that the local native people murdered them; others think that the colonists went off to live with the native people and start a new life. Still others think that the colonists tried to sail home to England and were lost at sea. No one knows for sure.

Become a detective as you read this true story, study the clues, and try to figure out the fate of the lost colony of Roanoke. The Unsolved Mystery from History series is written by acclaimed author Jane Yolen and former private investigator Heidi Elisabet Yolen Stemple. Read carefully and check your clues. You might be the first to solve a puzzle that has baffled people for years..
Price: $7.20 [Notify me when price goes down.]

In 1692 Salem, Massachusetts, witnessed one of the saddest and most inexplicable chapters in American history.

When a group of girls came down with a horrible, mysterious bout of illness, the town doctor looked in his medical books but failed to find a reasonable diagnosis. Pretty soon everyone in town was saying the same thing: The girls were ill because they were under a spell, the spell of witchcraft! And still, the question remains: Why did the hysteria occur? The townspeople had many things to worry about back then: smallpox, strife with the local Indians, a preacher demanding higher wages, and the division of land in the community. But did all of those problems justify a witch hunt?

Become a detective as you read this true story, study the clues, and try to understand the hysteria! The Unsolved Mystery from History series is written by acclaimed author Jane Yolen and former private investigator Heidi Elisabet Yolen Stemple. This is an innovative history lesson that's sure to keep kids thinking throughout..
Price: $7.20 [Notify me when price goes down.]

"No praise can be too high for Russell's mastery."—Publishers Weekly (starred review)

A bestselling author and a leading expert on the JFK assassination, Dick Russell (The Man Who Knew Too Much) here compiles a fascinating selection of his latest research into the assassination of our thirty-fifth president. These pieces cover every aspect of the JFK assassination, from the shots, to the subsequent investigation, to the Warren Report. Russell's research analyzes newly declassified information and continues to build upon his painstakingly detailed investigations. His unrivalled scholarship has created one of the most comprehensive and authoritative examinations of the assassination to date. Russell has come closer than ever to solving the ultimate question: Who killed JFK?.
Price: $16.47 [Notify me when price goes down.]

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Price: $8.61 [Notify me when price goes down.]