Cover -- Copyright -- Dedication -- CONTENTS -- Why is the sky blue? -- Why are moths attracted to lights? -- Can the Great Wall of China be seen from space? -- Why were neck ties invented? -- What causes jet lag and how can it be prevented and cured? -- Why do we yawn and why is it contagious? -- What is a blue moon? -- What are the origins of Boxing Day? -- Do you get wetter when walking in the rain than you do when running? -- Does water travel down the plughole in different directions in the Northern and Southern hemispheres? -- Is one dog year equal to seven human years? -- How did Lord's, the famous home of cricket, get its name? -- Why do buses often come in threes? -- Why do women talk more than men do, but can't read maps as well as men? -- Why do people need sleep? -- Is the drink Red Bull dangerous? -- Do we really use only 10 per cent of our brains? -- Why do people often wake up just before the alarm? -- How do mobile phones work? -- Was the 1969 Moon landing a fake? -- When did the game Rock, Paper, Scissors begin? -- Why do people twitch as they fall asleep? -- What is the common cold and how is it cured? -- What is the Internet and how does it differ from the World Wide Web? -- When was toilet paper invented and what was used before then? -- Why do people dream? -- How similar are humans to apes? -- Who wrote the Bible, and when? -- Why do women and not men take the contraceptive pill? -- Where does the saying 'as mad as a hatter' come from? -- Why do people have tonsils? -- How intelligent are dolphins? -- How do people count cards in casinos? -- Why do some coins have ridges around the edge? -- Did Robin Hood actually exist? -- What causes hangovers and how are they cured? -- Where did the term 'rock 'n' roll' come from? -- Why do snooze alarms go off every nine minutes?.

Why is the US baseball competition final called the World Series? -- How do people pick locks? -- What is the history of the Leaning Tower of Pisa? -- Are cats and dogs colourblind? -- Do hair and fingernails continue to grow after people have died? -- Why do people cry? -- Can babies hear voices while inside the womb? -- How do messenger pigeons know where to go? -- How do people speed-read? -- Was Nostradamus able to predict the future? -- What is subliminal advertising and does it work? -- How do salmon find their exact birthplace? -- Why does the date for Easter change? -- What is the origin of the term 'rule of thumb'? -- What is the small thing that hangs at the back of the mouth? -- How do rabbits and hares differ? -- How did the game of rugby originate? -- Where did the name 'Ku Klux Klan' originate? -- What is the difference between an ocean and a sea? -- Why is New York City called 'the Big Apple'? -- Why do men and women gain weight in different parts of the body? -- What makes a valuable diamond? -- Why do whales beach themselves? -- Why is belly-button lint generally blue? -- Why do phone numbers in American movies all start with 555? -- Why does coffee keep you awake? -- How did the marathon race begin? -- Why do bottles of tequila contain worms? -- What are aphrodisiacs and do they work? -- Why does catnip affect cats? -- Why is Friday the 13th thought to be unlucky? -- How do mirrors work? -- How did the word 'shit' originate? -- How can you tell if someone is lying? -- Why do men feel sleepy after sex? -- Why is 'God bless you' said after a sneeze? -- Why can't you tickle yourself? -- Why does human hair turn grey? -- Why do many prices end in ninety-nine pence? -- What is the difference between AIDS and HIV? -- How can direction be found without a compass? -- Why do people have an appendix? -- Why do golf balls have dimples?.

What is the origin of the term 'OK'? -- Does an elephant truly never forget? -- Why does sweat smell? -- Why does metal rust? -- Why do we have ear wax? -- Why do people shrink with age? -- Where did the fabric denim originate and why is it stitched with orange thread? -- Why do men have nipples? -- What is Coca-Cola made from and did it once contain cocaine? -- What is the purpose of pubic hair and why is it curly? -- What is acid rain and what causes it? -- Why did Kentucky Fried Chicken change its name to KFC? -- Is drinking too much water bad for you? -- Why are unidentified people called John and Jane Doe? -- Does chewing gum really take seven years to digest? -- How do crocodiles and alligators differ? -- Can it be too cold to snow? -- Why do we hiccup, and what causes them? -- Why did the Romans wear togas? -- Why do onions make people cry? -- Why is getting married called 'tying the knot'? -- Do swimming pools really contain a chemical that reveals urine? -- How does the Atkins diet work? -- What makes stomachs growl? -- Is chocolate addictive? -- Why do people sometimes see 'stars'? -- Is using sun beds bad for your skin? -- How does Viagra work? -- Why is a dollar called a 'buck' in the US? -- What are rainbows and how are they formed? -- Does shaved hair grow back thicker and darker? -- Why are people's eyes different colours? -- Where do flies and mosquitoes go in winter? -- Why do people stick out their tongue while concentrating? -- How did the saying 'dressed to the nines' originate? -- What causes 'ringing' in the ears? -- What are the origins of the hamburger and the hotdog? -- What is menstrual synchrony and does it exist? -- Does water pressure plummet during television advertisements in the US Super Bowl? -- Why do good restaurants allow you to taste wine before buying it? -- What is the history of St Valentine's Day?.

What are computer viruses and how do they work? -- Why does alcohol cause people to urinate so much? -- When was lipstick invented and what was its original purpose? -- Why does the sound of scraping fingernails make people cringe? -- What is the difference between a hurricane and a typhoon? -- How did the word 'cocktail' originate for some alcoholic drinks? -- Why is it thought that blonde women have more fun? -- Why do people get dizzy if spun around? -- Why is the pirate flag called the 'Jolly Roger'? -- Why does the penis shrink when it's cold? -- Is Caesar salad named after Julius Caesar? -- What is snot and why is it sometimes green? -- Does speaking to plants encourage them to grow? -- Why is a rabbit's foot considered good luck? -- How do flies land and walk upside down? -- What makes people get seasick and carsick? -- What is the horizon and is the distance to it always the same? -- Why do pregnant women get morning sickness? -- What is the origin of the tattoo? -- What is the G spot and where is it? -- How do hummingbirds hover? -- What causes people's ears to pop? -- What is cancer? -- Why do you never see baby pigeons? -- Why do people get acne? -- How did the 'missionary position' get its name? -- Why don't igloos melt on the inside? -- Does wearing tight underpants affect a man's sperm count? -- Where does the expression 'pipe dreams' come from? -- Why are parrots the only birds that talk? -- Why do people sneeze? -- How did April Fool's Day originate? -- Does sitting close to the TV or reading in poor light ruin your eyes? -- What is the difference between monkeys and apes? -- What are the seven wonders of the ancient world? -- How can you tell if someone is flirting with you? -- What are the JFK assassination theories? -- When and where did the game of chess originate?.

Why are the terms 'bull' and 'bear' used in connection with the stock market? -- Why does alcohol make people drunk? -- What makes animals warm- or cold-blooded? -- Why do pepper shakers have more holes than salt shakers? -- Does penis size vary depending on race? -- What is the difference between a donkey, an ass and a mule? -- Is suicide illegal? -- How do microwave ovens cook food? -- Is homosexuality a genetic trait? -- Did Dracula really exist? -- Why do kamikaze pilots wear helmets? -- Why is the number thirteen referred to as a 'baker's dozen'? -- Why do men often shiver after urinating? -- What causes a heart attack? -- Why do some beer heads disappear faster than others? -- What is hypnosis and is it possible? -- Where does the word 'hooray' come from? -- Why are men more likely to cheat on their partners than women? -- Do camel humps contain water? -- What is gravity and Einstein's theory of relativity? -- What evidence exists about the Loch Ness Monster? -- Are green potato crisps poisonous? -- Do taxi drivers have better than average memories? -- What is the difference between a herb and a spice? -- Can stress cause illness or death? -- How can water be found in dry conditions? -- Where did the term 'red herring' originate? -- What are the greenhouse effect and global warming? -- Why does the sound of running water give people the urge to urinate? -- Why is the Mona Lisa painting so famous? -- Why was Stonehenge built? -- What are crop circles and what causes them? -- Why do people say 'cheers' and clink glasses before drinking? -- Why do people crave salt, and why is too much considered bad for you? -- How can a fire be lit without matches? -- What caused the two World Wars? -- What is the best way to immobilise or kill a person using bare hands? -- What is sea level and does it vary? -- Why are lions associated with England?.

Which came first, the chicken or the egg?.