## One Hundred Essential Things You Didn't Know You Didn't Know: Math Explains Your WorldEminent cosmologist and writer John D. Barrow uses simple mathematics to answer one hundred perplexing questions from everyday life. Mathematics can reveal and illuminate things about the complex world we live in that can’t be found any other way. In this hugely informative and entertaining book, John D. Barrow takes the most perplexing of everyday phenomena—from the odds of winning the lottery and the method of determining batting averages to the shapes of roller coasters and the reasoning behind the fairest possible divorce settlements—and explains why things work the way they do. With elementary math and accompanying illustrations, he sheds light on the mysterious corners of the world we encounter every day. Have you ever considered why you always seem to get stuck in the longest line? Why two’s company but three’s a crowd? Or why there are six degrees of separation instead of seven? This clever little book has all the answers to these puzzling, everyday questions of existence that need not perplex us anymore. |

### What people are saying - Write a review

We haven't found any reviews in the usual places.

### Contents

Twos Company Threes a Crowd | 4 |

Its a Small World After All | 7 |

Monkey Business | 10 |

Independence Day | 13 |

Rugby and Relativity | 15 |

Wagons Roll | 17 |

A Sense of Proportion | 19 |

Why Does the Other Queue Always Move Faster? | 22 |

Walk Please Dont Run | 149 |

Mindreading Tricks | 151 |

The Planet of the Deceivers | 153 |

How to Win the Lottery | 155 |

A Truly Weird Football Match | 158 |

An Arch Problem | 160 |

Counting in Eights | 162 |

Getting a Mandate | 164 |

Pylon of the Month | 24 |

A Sense of Balance | 27 |

Bridging That Gap | 29 |

On the Cards | 33 |

Tally Ho | 37 |

Relationships | 40 |

Racing Certainties | 43 |

High Jumping | 46 |

Superficiality | 50 |

VAT in Eternity | 53 |

Living in a Simulation | 55 |

Emergence | 59 |

How to Push a Car | 62 |

Positive Feedback | 65 |

The Drunkards Walk | 67 |

Faking It | 69 |

The Flaw of Averages | 72 |

The Origami of the Universe | 74 |

Easy and Hard Problems | 76 |

Is This a Record? | 79 |

A DoltYourself Lottery | 82 |

I Do Not Believe It | 84 |

Flash Fires | 86 |

The Secretary Problem | 89 |

Fair Divorce Settlements the WinWin Solution | 93 |

Many Happy Returns | 96 |

Tilting at Windmills | 99 |

Verbal Conjuring | 102 |

Financial Investment with Time Travellers | 104 |

A Thought for Your Pennies | 107 |

Breaking the Law of Averages | 110 |

How Long are Things Likely to Survive? | 112 |

A President who Preferred the Triangle to the Pentagon | 115 |

Secret Codes in Your Pocket | 119 |

Ive Got a Terrible Memory for Names | 123 |

Calculus Makes You Live Longer | 125 |

Getting in a Flap | 127 |

Your Numbers Up | 130 |

Double Your Money | 132 |

Some Reflections on Faces | 134 |

The Most Infamous Mathematician | 138 |

Roller Coasters and Motorway Junctions | 142 |

A Taylormade Explosion | 146 |

The Twoheaded League | 167 |

Creating Something out of Nothing | 169 |

How to Rig An Election | 172 |

The Swing of the Pendulum | 175 |

A Bike with Square Wheels | 177 |

How Many Guards Does an Art Gallery Need? | 179 |

and What About a Prison? | 184 |

A Snooker Trick Shot | 186 |

Brothers and Sisters | 189 |

Playing Fair with a Biased Coin | 192 |

The Wonders of Tautology | 194 |

What a Racket | 196 |

Packing Your Stuff | 200 |

Sent Packing Again | 202 |

Crouching Tiger | 207 |

How the Leopard Got His Spots | 210 |

The Madness of Crowds | 212 |

Diamond Geezer | 215 |

The Three Laws of Robotics | 219 |

Thinking Outside the Box | 222 |

Googling in the Caribbean The Power of the Matrix | 225 |

Loss Aversion | 229 |

The Lead in Your Pencil | 231 |

Testing Spaghetti to Destruction | 233 |

The Gherkin | 235 |

Being Mean with the Price Index | 238 |

Omniscience can be a Liability | 241 |

Why People arent Cleverer | 243 |

The Man from Underground | 245 |

There are No Uninteresting Numbers | 247 |

Incognito | 249 |

The Ice Skating Paradox | 252 |

The Rule of Two | 255 |

Segregation and Micromotives | 257 |

Not Going with the Flow | 259 |

Venn Vill They Ever Learn | 261 |

Some Benefits of Irrationality | 264 |

Strange Formulae | 269 |

Chaos | 273 |

All Aboard | 276 |

The Global Village | 279 |

Notes | 282 |

### Other editions - View all

### Common terms and phrases

angle arithmetic mean average number ball best candidate bigger birthday cards catenary cent centimetres centre of gravity chance choice Clothoid coin counting create crowd diamond digits divide equal example ﬂat ﬂoor formula gallery geometric mean golden goal guard half happens interesting large number length look Loss Aversion match mathematician mathematics mean metres per second mirror move odds paper sizes pencil pick pieces play possible predict prime numbers probability problem Professor james Moriarty race walkers random record rectangles reﬂection Reliant Robin result robot score sequence shape side simple simulated simulated realities sort speed square square wheels strategy Suppose surface tails tell things ticket tion total number triangles Valley of Fear vertical votes wall weight wheel wind windmill zero