The Magic Numbers of Dr. Matrix draws us into the intriguing and fascinating world of numbers and number theory. "Numbers, you know, have a mysterious life of their own. It would be naive," claims Dr. Matrix, "to suppose that there is such a thing as a randomly arranged group of symbols." Consider, for example, the decimal expansion of pi. Long considered a random series, it is actually rich with remarkable patterns. "Correctly interpreted," says Dr. Matrix, "pi conveys the entire history of the human race." Dr. Matrix uncovers patterns and signs that will astound you. As Dr. Matrix demonstrates, we need only look to find clues all around us in number and language "coincidences" that will unlock the mysteries of the universe. In The Magic Numbers of Dr. Matrix, Martin Gardner introduces us to this extraordinary man, Dr. Irving Joshua Matrix. Believed by many to be the greatest numerologist who ever lived, Dr. Matrix claims to be a reincarnation of Pythagoras. He was, however, completely unknown to the scientific community until Gardner wrote about him in Scientific American in 1960. That first report and the subsequent ones that appeared with each new encounter are collected here in their entirety. We follow Dr. Matrix as he roams the world and assumes new identities and discovers new manifestations of the power of numbers to explain and predict and entertain. Always at his side is his beautiful Eurasian daughter, Iva, who abets and protects her father in each new adventure. As you delve into The Magic Numbers of Dr. Matrix, you will master some significant combinatorial mathematics and number theory. The many remarkable puzzles of Dr. Matrix are all clearly answered in the back of the book, together with commentary and references by Gardner to enlighten the uninitiated and entertain the inquiring reader.

Part of a new, exciting series of ethical, sustainable and earth-friendly jigsaw puzzles. This high-quality, 1000-piece jigsaw puzzle from Flame Tree is made with renewable board, sturdy pieces and a recyclable bag and features powerful and popular works of art. The 1000 pieces will satisfy your need for a challenge, with the charming Floral by Kate Heiss. Intended for adults and children over 13 years. Not suitable for children under 3 years due to small parts. Finished Jigsaw size 735 x 510mm / 29 x 20 ins. FSC, recycled materials used. Kate Heiss is a contemporary British Printmaker who creates limited edition screen prints and linocuts on paper. Kate studied at the Royal College of Art graduating with an MA in Textile Design in 1997. She then worked as a Textile Designer across a wide range of fashion brands before setting up her own Printmaking Studio in 2011. Kate creates dynamic, vibrant, illustrative prints that are inspired by her love of nature. She draws inspiration from the flowers and birds in her garden, the landscapes of East Anglia and her love of bold, colourful floral patterns found in textiles. Her work is handmade in her studio in Hertfordshire and is regularly exhibited across the UK. SUSTAINABLY SOURCED. This puzzle is created using FSC (R) paper, board and a recyclable bag. Flame Tree actively strives to promote ethical development and environmental conservation.

Not unlike the lyrical genius of David Bowie, jigsaw puzzles are at times mystifying yet always satisfying. Not only is the Where’s Bowie? Jigsaw Puzzle a fun 500-piece detail-focused puzzle, it’s also a ‘Find Bowie’ interactive adventure. On the finished puzzle, hidden in multiple places across the detailed image, Bowie – in his various chameleonic guises – is patiently waiting to be spotted by a well-trained eye. It’s like Where’s Waldo? but, well, better, because it’s about Bowie! This jigsaw is jam-packed with Bowie references that might even teach the most hardened Bowie-aficionado a thing or two. In case you missed it – jigsaws are back, baby! Give yourself a much-needed digital detox, turn off your phone/tablet/laptop screens, grab a stiff drink, and put on your puzzle hat. This 500-piece jigsaw puzzle is going to take some good ol’ fashion puzzling.

Wild Spirit 500 Piece Puzzle from Galison playfully illustrates 12 animal heads festooned with various beautiful flowers. Galison puzzles are packaged in matte-finish sturdy boxes, perfect for gifting, reuse, and storage. * 500 Pieces, Ribbon Cut * Box: 8 x 8 x 1.5", 203 x 203 x 41mm, Puzzle: 20 x 20", 508 x 508 mm * Includes Color Puzzle Insert with Puzzle Image * Virtually No Puzzle Dust * Puzzle greyboard contains 90% recycled paper. Packaging contains 70% recycled paper and is made responsibly from FSC-certified material. Printed with nontoxic inks.

The Mensa Riddles and Conundrums Pack explores some of the most fascinating areas of puzzling pleasure. As well as some really challenging lateral-thinking puzzles and brain-befuddling riddles, it contains a variety of ingenious games designed to challenge the most demanding mind. There are lateral-thinking problems of great cunning, ancient games from China and Siam, and a host of original puzzles that will stretch ingenuity to breaking point. It is rare to find such a diverse collection of puzzles and games in one place. They call for a wide variety of puzzling skills and will keep readers pleasurably engrossed for many, many hours! Contains more than 50 fiendishly difficult riddles and conundrums; double-sided game board with dice and counters; tangram set; pentominoes set; matchsticks; jailbreak game.

In 299 Dogs (and a cat), a cunning cluster puzzle, there are no regular jigsaw shapes and a whole lot of canines! Have you got what it takes to assemble all 299 dogs into a perfect puzzle? A great game for avid puzzlers, families, kids and pet lovers alike - it will provide hours of fun! The follow-up to 299 Cats (and a dog), (shortlisted for the 2021 Gift of The Year Awards!) A JIGSAW WITH A TWIST: no two shapes are the same, and each piece is a dog (except for one that's a cat. See if you can find it!) HOURS OF MADDENING FUN. Have you got what it takes to assemble all 299 dogs into a perfect puzzle? CHARMING ILLUSTRATIONS by Lea Maupetit STURDY & ATTRACTIVE BOX perfect for gifting and storage

In 2008, November 23-28, the workshop of "Classical Problems on Planar Polynomial Vector Fields " was held in the Banff International Research Station, Canada. Called "classical problems", it was concerned with the following: (1) Problems on integrability of planar polynomial vector fields. (2) The problem of the center stated by Poincare for real polynomial differential systems, which asks us to recognize when a planar vector field defined by polynomials of degree at most n possesses a singularity which is a center. (3) Global geometry of specific classes of planar polynomial vector fields. (4) Hilbert's 16th problem. These problems had been posed more than 110 years ago. Therefore, they are called "classical problems" in the studies of the theory of dynamical systems. The qualitative theory and stability theory of differential equations, created by Poincare and Lyapunov at the end of the 19th century, had major developments as two branches of the theory of dynamical systems during the 20th century. As a part of the basic theory of nonlinear science, it is one of the very active areas in the new millennium. This book presents in an elementary way the recent significant developments in the qualitative theory of planar dynamical systems. The subjects are covered as follows: the studies of center and isochronous center problems, multiple Hopf bifurcations and local and global bifurcations of the equivariant planar vector fields which concern with Hilbert's 16th problem. The book is intended for graduate students, post-doctors and researchers in dynamical systems. For all engineers who are interested in the theory of dynamical systems, it is also a reasonable reference. It requires a minimum background of a one-year course on nonlinear differential equations.

Are you smarter than a Singaporean ten-year-old? Can you beat Sherlock Holmes? If you think the answer is yes - I challenge you to solve my problems. Here are 125 of the world's best brainteasers from the last two millennia, taking us from ancient China to medieval Europe, Victorian England to modern-day Japan, with stories of espionage, mathematical breakthroughs and puzzling rivalries along the way. Pit your wits against logic puzzles and kinship riddles, pangrams and river-crossing conundrums. Some solutions rely on a touch of cunning, others call for creativity, others need mercilessly logical thought. Some can only be solved be 2 per cent of the population. All are guaranteed to sharpen your mind. Let's get puzzling!

This is the third level of this puzzling series. This handy spiralbound format can be laid flat. Only hardcore kakuro devotees should dare enter here. For those who can, it's head-exploding puzzle solving. Kakuro is a puzzle type in which sums are given and solvers must deduce the numbers in the individual boxes.

From the bestselling author of 52 Things to Do While You Poo, this nostalgic mix of trivia and puzzles will bring back the awesome appeal of the Eighties If you grew up in the 1980s, you know that nothing compares to the music, fashion, toys, TV, films and sheer feel of that decade. But how much can you really remember? When you next take a trip to the toilet, this colourful collection of puzzles, activities and trivia will serve as a leisurely stroll down memory lane, dusting off half-remembered facts and even filling in a few gaps. From bestselling author and fiendish brain-teaser Hugh Jassburn, this illustrated celebration of history's finest decade includes the following challenges and more: Help Arnie navigate through a jungle maze to get to the chopper Match hit songs to the year they came out Solve trivia questions relating to Madonna and the TV show Dallas Track down the names of iconic world leaders in a word search Spot the differences in a sea of Rubik's cubes 52 Things to Do While You Poo: The 1980s Edition is the perfect gift for those who lived through these glory days - or those who just wish they had.

Supersized word search fun! Everything is bigger in The Everything Easy Large-Print Word Search Book, Volume 6--the letters, the clues, the grids--and especially the fun! Each of these brand-new puzzles helps you improve vocabulary, memory, and problem-solving skills. With clues ranging from beloved books and classic TV shows to favorite foods and popular vacation spots, these light and easy puzzles are perfect for taking a break--and exercising your mind! Whether you're a beginner or an experienced puzzler, you'll enjoy the satisfaction of quickly solving these entertaining word searches.

Do you know your arsole from your electron? Whether tritium or trivium, this periodically puzzling collection of over 400 different quiz questions, word games and brain teasers will challenge the chemist in you. Drawing on an illustrated cornucopia of chemicals with subjects ranging from the sub-atomic to the astronomic, stories of scientists, their quirks, discoveries, and inventions will delight and inspire you. Journey through tales of how chemistry and other sciences have touched all our lives, from the food we eat to the air that we breathe, from the novels that we read to the movies that we watch. Elementary! is compiled by the Royal Society of Chemistry's puzzler Paul Board, with each chapter concentrating on a particular branch of science or facet of life. Explore scientists and superpowers, particles, places, plants, planets and poisons, and more. Get your thinking cap on!

From Kerby Rosanes, the internationally bestselling artist who brought you the Morphia series, the next book in his brilliant new Worlds universe. Mythic World is 96 double-sided pages of pure mythical creation that colorists will love. Welcome to Kerby's mythic world. Mythic World is a new, fantastic, and super-detailed adult coloring book from the prodigious bestselling illustrator. Colorists will find Kerby Rosanes's new creations to be hypnotic, with spread after dizzying spread featuring mythic creatures, magical landscapes, and surprise after surprise in the details of Kerby's ultra-fine illustrations. This book blurs the line between familiar and magical, between reality and imagination. Fans and newcomers alike will be thrilled with this 96-page book, providing an apparently endless coloring challenge for even his most dedicated and enthusiastic followers.

Gray Malin's awe-inspiring aerial photographs are shot from doorless helicopters, creating stunning celebrations of natural form, color, and repetition. This two-sided puzzle features a majestic mountainside ski-slope and skiers on one side and an array of rainbow hues decorating the crisp white snow of a luxury ski resort on the other side.

Based on the hit card game that has sold millions of copies around the world, the Unlock! Escape Adventure Puzzle Book provides a new way to enjoy the popular Unlock! Escape Adventure series. Immerse yourself in this colourful escape-room experience, which can be enjoyed either at home on your own or with a group. There are three adventures for you to challenge yourself against, each with their own charming narrative: Enter a secret underground lab to recover a mysterious and important serum that has the potential to drastically change the world! The dastardly Professor NoSide has trapped you in his lair! With the help of a friendly mouse, can you free yourself in time to foil his evil plans? Your friend Professor Tempus has disappeared, just as you arrived to experiment with his time machine. Can you solve the mystery before our timeline is damaged forever? Are you up to the challenge? You will have to use all of your wits, logic and skill to solve these puzzles, escape and SAVE THE WORLD!

This unique and delightful map of mainland Scotland and the Hebrides, from the collection of the National Library of Scotland, is a magnificent pictorial map of Scotland. Not just annotated with beautiful calligraphy, it also includes dozens of vignettes of famous Scottish places, from cities and towns to lochs to mountains and castles, as well as people and animals. It was originally published in 1931 by Pratts Oil, which was known as Standard Oil in the US and a few months later as Esso in the UK.

Puzzles are good for the brain. Solving the brainteasers in this challenging collection will keep your mind in tip-top shape--synapses firing on all cylinders!

Full of engaging and enjoyable games, this stimulating volume of all-new puzzles includes:

• Crossword puzzles
• Word searches
• Sudoku puzzles
• Cryptoquotes
• And many more!

In all, nine different types of puzzles will help you improve your mental fitness--and have fun doing it!