The Drunkard's Walk: How Randomness Rules Our Lives
by Leonard Mlodinow
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Book Summary Information
Author: Leonard MlodinowEdition: Hardcover
Published: 2008-05-13
ISBN: 0375424040
Number of pages: 272
Publisher: Pantheon
Book Reviews of The Drunkard's Walk: How Randomness Rules Our Lives
Book Review: Thought-Provoking Examples of Randomness in Our Lives
Summary: 5 Stars
Instead of repeating other reviewers, let's focus on other content.
Arguments about the astronomical improbably of a DNA chance match are disingenuous. A false match can also occur because of lab error, and this is far, far more likely than a genuine DNA chance match.
Mlodinow illustrates the Bayesian principle: "...the probability that A will occur if B occurs will generally differ from the probability that B will occur if A occurs." (p. 117) About 1 in 10,000 heterosexual non-IV-drug-abusing white males are infected with HIV. As for tests of HIV infection, the rate of false negatives is about zero, and that of false positives is 1 in 1,000. So, out of 10,000 tested subjects, there will be 9, 989 negatives. Of the 11 positives, 10 will be false and 1 will be true. So only 1 in 11 individuals who test positive for HIV actually are infected with HIV. (pp. 115-116)
During WWII, German V-2 rockets often hit near each other, prompting fears that the Germans had perfected pinpoint accuracy in their targeting. It turned out that the clusters of hits were random. Most geographical clusters of cancer occurrence also are random clusters.
We learn about such things as regression toward the mean, Pascal's wager, the gambler's fallacy, and the scratched (and therefore biased) roulette wheels at Monte Carlo. Also, election recounts in very close elections are bound to differ with each recount owing solely to small random errors operating on millions and millions of votes. So no recount is necessarily more accurate than the original count.
Life expectancy applies to groups, not individuals. For instance, if the life expectancy of a 90 year-old is 6 years, it only tells us that half of 90-year olds will still be alive at 96. It does not tell us which particular 90 year-old individual will still be alive at 96.
When there are hundreds of coin tosses, it is common for strings of consecutive "heads" and "tails" to arise solely by chance. Likewise, a string of good luck or bad luck in our lives can be completely random, yet easily misinterpreted as something meaningful.
When experimental subjects are told that, by pressing a button, they are controlling actually randomly-flashing lights, they readily believe it. We want to believe that we are in control because a lack of control, or perceived lack of control, leads to stress. This is especially true in extreme situations. For instance, concentration-camp victims who survived tended to be those who established some measure of control over their horrible experiences.
Summary of The Drunkard's Walk: How Randomness Rules Our Lives
Amazon Guest Review: Stephen HawkingPublished in 1988, Stephen Hawking's A Brief History of Time became perhaps one of the unlikeliest bestsellers in history: a not-so-dumbed-down exploration of physics and the universe that occupied the London Sunday Times bestseller list for 237 weeks. Later successes include 1995's A Briefer History of Time, The Universe in a Nutshell, and God Created the Integers: The Mathematical Breakthroughs that Changed History. Stephen Hawking is Lucasian Professor of Mathematics at the University of Cambridge.
In The Drunkard's Walk Leonard Mlodinow provides readers with a wonderfully readable guide to how the mathematical laws of randomness affect our lives. With insight he shows how the hallmarks of chance are apparent in the course of events all around us. The understanding of randomness has brought about profound changes in the way we view our surroundings, and our universe. I am pleased that Leonard has skillfully explained this important branch of mathematics. --Stephen Hawking In this irreverent and illuminating book, acclaimed writer and scientist Leonard Mlodinow shows us how randomness, change, and probability reveal a tremendous amount about our daily lives, and how we misunderstand the significance of everything from a casual conversation to a major financial setback. As a result, successes and failures in life are often attributed to clear and obvious cases, when in actuality they are more profoundly influenced by chance.
The rise and fall of your favorite movie star of the most reviled CEO--in fact, of all our destinies--reflects as much as planning and innate abilities. Even the legendary Roger Maris, who beat Babe Ruth's single-season home run record, was in all likelihood not great but just lucky. And it might be shocking to realize that you are twice as likely to be killed in a car accident on your way to buying a lottery ticket than you are to win the lottery.
How could it have happened that a wine was given five out of five stars, the highest rating, in one journal and in another it was called the worst wine of the decade? Mlodinow vividly demonstrates how wine ratings, school grades, political polls, and many other things in daily life are less reliable than we believe. By showing us the true nature of change and revealing the psychological illusions that cause us to misjudge the world around us, Mlodinow gives fresh insight into what is really meaningful and how we can make decisions based on a deeper truth. From the classroom to the courtroom, from financial markets to supermarkets, from the doctor's office to the Oval Office, Mlodinow's insights will intrigue, awe, and inspire.
Offering readers not only a tour of randomness, chance, and probability but also a new way of looking at the world, this original, unexpected journey reminds us that much in our lives is about as predictable as the steps of a stumbling man fresh from a night at the bar.
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