A New York Times bestselling mathematician reveals how math can take your game playing and puzzle solving to the next level.“A thrilling tour of all the ways you can win with math.” —Matt Parker, author of the international bestseller Humble Pi“A winning book by a winning personality.” —Ben Orlin, author of Math Games with Bad Drawings...

These simple math secrets and tricks will forever change how you look at the world of numbers.Secrets of Mental Math will have you thinking like a math genius in no time. Get ready to amaze your friends—and yourself—with incredible calculations you never thought you could master, as renowned “mathemagician” Arthur Benjamin shares his techniques for lightning-quick calculations and amazing number tricks. This book will teach you to do math in your head fast...

Did you know that it's easier to add and subtract from left to right, rather than the other way round? And that you can be taught to square a three-digit number in seconds?In Think Like A Maths Genius, two mathematicians offer tips and tricks for doing tricky maths the easy way. With their help, you can learn how to perform lightning calculations in your head, discover methods of incredible memorisation and other feats of mental agility.Learn maths secrets for the ...

The history, formulas, and most famous puzzles of graph theoryGraph theory goes back several centuries and revolves around the study of graphs—mathematical structures showing relations between objects. With applications in biology, computer science, transportation science, and other areas, graph theory encompasses some of the most beautiful formulas in mathematics—and some of its most famous problems. The Fascinating World of Graph Theory explores the ques...

The world's greatest mental mathematical magician takes us on a spellbinding journey through the wonders of numbers (and more)"Arthur Benjamin . . . joyfully shows you how to make nature's numbers dance." -- Bill Nye (the science guy)The Magic of Math is the math book you wish you had in school. Using a delightful assortment of examples-from ice-cream scoops and poker hands to measuring mountains and making magic squares-this book revels in key mat...

In a noisy world hungry for peace and purpose, this devotional calls you to rediscover the quiet, powerful voice of the Holy Spirit. Over forty days, you'll journey from surface religion into spiritual depth-learning to recognize God's whispers, rest in His love, and walk boldly in His leading.Each day offers a sacred rhythm of prayer, reflection, and fasting that turns your daily moments into holy encounters. The Spirit meets you where you are-transforming commutes into communion,...

THE CLUTCHING HAND "Jameson, here's a story I wish you'd follow up," remarked the managing editor of the Star to me one evening after I had turned in an assignment of the late afternoon. He handed me a clipping from the evening edition of the Star and I quickly ran my eye over the headline: "THE CLUTCHING HAND" WINS AGAIN NEW YORK'S MYSTERIOUS MASTER CRIMINAL PERFECTS another COUP CITY POLICE COMPLETELY BAFFLED "Here's this murder of Fletcher, the retired banker and trustee of the Universi...

A CAMERA CRIME "Camera!" Kennedy and I had been hastily summoned from his laboratory in the city by District-Attorney Mackay, and now stood in the luxurious, ornate library in the country home of Emery Phelps, the banker, at Tarrytown. "Camera!—you know the call when the director is ready to shoot a scene of a picture?—well—at the moment it was given and the first and second camera men began to grind—she crumpled—sank to the floor—unconscious!" Hot and excited, Mackay endeavored to reenact...

As I look back now on the sensational events of the past months since the great European War began, it seems to me as if there had never been a period in Craig Kennedy's life more replete with thrilling adventures than this. In fact, scarcely had one mysterious event been straightened out from the tangled skein, when another, even more baffling, crowded on its very heels. As was to have been expected with us in America, not all of these remarkable experiences grew either directly or indire...

Until I receive those materials from Doctor Leslie to make the poison tests, considered Kennedy, as we walked slowly the few blocks to the laboratory, "I can't see that there is much I can do but wait." In his laboratory, he paused before his well-stocked shelves with their miscellaneous collection of books on almost every conceivable subject. Absently he selected a volume. I could see that it was one of the latest translated treatises on this new psychology from the pen of the eminent sci...

There was something of the look of the hunted animal brought to bay at last in Carlton Dunlap's face as he let himself into his apartment late one night toward the close of the year. On his breath was the lingering odor of whisky, yet in his eye and hand none of the effects. He entered quietly, although there was no apparent reason for such excessive caution. Then he locked the door with the utmost care, although there was no apparent reason for caution about that, either. Even when he had...

I am not by nature a spy, Professor Kennedy, but—well, sometimes one is forced into something like that." Maude Euston, who had sought out Craig in his laboratory, was a striking girl, not merely because she was pretty or because her gown was modish. Perhaps it was her sincerity and artlessness that made her attractive. She was the daughter of Barry Euston, president of the Continental Express Company, and one could readily see why, aside from the position her father held, she should be am...