50 Easy puzzles to stay sharp, relax and relieve stress! This large print puzzle book is perfect for any level, from Beginners to Expert. The 6x9 size makes it perfect for travel; whether around town, the globe, or relaxing at home. Enjoy the fun of working your way through the mazes one by one. ★ Perfect for Beginners and Experts alike ★ Convenient 6x9 size is perfect for travel on the go ★ Relax & Solve Let your Inner Child out to play!

Unlock the secrets to creating random mazes! Whether you're a game developer, an algorithm connoisseur, or simply in search of a new puzzle, you're about to level up. Learn algorithms to randomly generate mazes in a variety of shapes, sizes, and dimensions. Bend them into Moebius strips, fold them into cubes, and wrap them around spheres. Stretch them into other dimensions, squeeze them into arbitrary outlines, and tile them in a dizzying variety of ways. From twelve little algorithms, you'll discover a vast reservoir of ideas and inspiration. From video games to movies, mazes are ubiquitous. Explore a dozen algorithms for generating these puzzles randomly, from Binary Tree to Eller's, each copiously illustrated and accompanied by working implementations in Ruby. You'll learn their pros and cons, and how to choose the right one for the job. You'll start by learning six maze algorithms and transition from making mazes on paper to writing programs that generate and draw them. You'll be introduced to Dijkstra's algorithm and see how it can help solve, analyze, and visualize mazes. Part 2 shows you how to constrain your mazes to different shapes and outlines, such as text, circles, hex and triangle grids, and more. You'll learn techniques for culling dead-ends, and for making your passages weave over and under each other. Part 3 looks at six more algorithms, taking it all to the next level. You'll learn how to build your mazes in multiple dimensions, and even on curved surfaces. Through it all, you'll discover yourself brimming with ideas, the best medicine for programmer's block, burn-out, and the grayest of days. By the time you're done, you'll be energized and full of maze-related possibilities! What You Need: The example code requires version 2 of the Ruby programming language. Some examples depend on the ChunkyPNG library to generate PNG images, and one chapter uses POV-Ray version 3.7 to render 3D graphics.

It is the 1960s. The stars are coming right.

This landmark work chronicles the origin and evolution of solid state physics, which grew to maturity between 1920 and 1960. The book examines the early roots of the field in industrial, scientific and artistic efforts and traces them through the 1950s, when many physicists around the world recognized themselves as members of a distinct subfield of physics research centered on solids. The book opens with an account of scientific and social developments that preceded the discovery of quantum mechanics, including the invention of new experimental means for studying solids and the establishment of the first industrial laboratories. The authors set the stage for the modern era by detailing the formulation of the quantum field theory of solids. The core of the book examines six major themes: the band theory of solids; the phenomenology of imperfect crystals; the puzzle of the plastic properties of solids, solved by the discovery of dislocations; magnetism; semiconductor physics; and collective phenomena, the context in which old puzzles such as superconductivity and superfluidity were finally solved. All readers interested in the history of science will find this absorbing volume an essential resource for understanding the emergence of contemporary physics.

For every athlete or sports fanatic who knows she's just as good as the guys. This is for fans of The Running Dream by Wendelin Van Draanen, Grace, Gold, and Glory by Gabrielle Douglass and Breakaway: Beyond the Goal by Alex Morgan. The summer before Caleb and Tessa enter high school, friendship has blossomed into a relationship . . . and their playful sports days are coming to an end. Caleb is getting ready to try out for the football team, and Tessa is training for cross-country. But all their structured plans derail in the final flag game when they lose. Tessa doesn’t want to end her career as a loser. She really enjoys playing, and if she’s being honest, she likes it even more than running cross-country. So what if she decided to play football instead? What would happen between her and Caleb? Or between her two best friends, who are counting on her to try out for cross-country with them? And will her parents be upset that she’s decided to take her hobby to the next level? This summer Caleb and Tessa figure out just what it means to be a boyfriend, girlfriend, teammate, best friend, and someone worth cheering for. “A great next choice for readers who have enjoyed Catherine Gilbert Murdock’s Dairy Queen and Miranda Kenneally’s Catching Jordan.”—SLJ “Fast-paced football action, realistic family drama, and sweet romance…[will have] readers looking for girl-powered sports stories…find[ing] plenty to like.”—Booklist “Tessa's ferocious competitiveness is appealing.”—Kirkus Reviews “[The Football Girl] serve[s] to illuminate the appropriately complicated emotions both of a young romance and of pursuing a dream. Heldring writes with insight and restraint.”—The Horn Book

Journey into the world of Peter Pan and its mysterious inhabitants. The book is a feature-length hex crawl campaign, filled with endless adventure, adapted from the tales of Peter Pan, and tailored for an older audience.