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"aha! Gotcha" and "aha! Insight" are here combined as a single volume. The aha! books, as they are referred to by fans of the author Martin Gardner, contain 144 wonderful puzzles from the reigning king of recreational mathematics. In this combined volume, you will find puzzles ranging over geometry, logic, probability, statistics, number,time, combinatorics, and word play. Gardner calls these puzzles aha! problems. He explains that aha! problems "seem difficult, and indeed are difficult if you go about trying to solve them in traditional ways. But if you can free your mind from standard problem solving techniques, you may be receptive to an aha! reaction that leads immediately to a solution. Don't be discouraged if, at first, you have difficulty with these problems. Try your best to solve each one before you read the answer. After a while you will begin to catch the spirit of offbeat , nonlinear thinking, and you may be surprised to find your aha! ability improving." Studies show that persons who possess a high aha! ability are all intelligent to a moderate level, but beyond that level there seems to be no correlation between high intelligence and aha! thinking. So dig into some of the puzzles in this book, and prepare yourself for an aha! experience.

1914年生于美国俄克拉荷马州的塔尔萨，1936毕业于芝加哥大学哲学系。1957年，加德纳在《科学美国人》杂志上开设了一个数学游戏专栏，这个专栏一直延续了四分之一个世纪，成为杂志的一个招牌栏目。他的数学科普著作被翻译成多国文字出版。由于数学科普方面的贡献，他荣获1987年美国数学会斯蒂尔奖和1994年数学交流奖。

前言 Introduction
第一章 组合 Chapter 1 Combinatorial aha!
泡泡糖问题 A Sticky Gum Problem
乒乓赛难题 The Ping Pong Puzzle
奎贝尔的玻璃杯 Quibble's Glasses
令人困窘的道路 Perplexing Paths
搞错了的婴儿 The Bewildered Babies
奎贝尔的塑料杯 Quibble's Cups
炙肉片策略 Steak Strategy
难铺的瓷砖 The Troublesome Tiles
奎贝尔的动物 Quibble's Pets
药品小混 The Medicine Mix-up Small
药品大混 The Medicine Mix-up Big
断金链 The Broken Bracelet
第二章 几何 Chapter 2 Geometry aha!
巧分乳酪 Crafty Cheese Cuts
隐蔽的尺寸 Dimensions in Disguise
骑士大调动 The Big Knight Switch
奇妙的刀 Surprising Swords
航空飞行 Payoff at the Poles
奎贝尔的火柴 Quibble's Matches
巧妙的划分 Devilish Divisions
尤卡里特小姐的立方体 Miss Euclid's Cubes
地毯难题 Carpet Confusion
蛋糕的稀奇切法 The Curious Cake Cut
第三章 数字 Chapter 3 Number aha!
掰开的唱片 Broken Records
海峡怪兽 Loch Ness Monster
多余的一个 One Too Many
眼睛和脚 Eyes and Legs
撞车事件 The Big Bump
神秘的商品 Mysterious Merchandise
未列入电话簿的电话号码 The Unlisted Phone Number
倒霉的帽子 Hapless Hat
钱币问题 Money Matters
亨利叔叔的钟 Uncle Henry's Clock
1776年的精神 Spirits of 1776
第四章 逻辑 Chapter 4 Logic aha!
狡猾的司机 The Crafty Cabbie
颜色的搭配 Color Mates
六则怪谜语 Six Sneaky Riddles
大盗贼 The Big Holdup
阿克博士的测验 Dr. Ach's Tests
阿克奖 The Ach Award
假日理发 Holiday Haircut
理发店的玩笑 Barbershop Bantor
太阳谷的谋杀者 Murder at Sun Valley
喷泉边的谋杀 Foul Play at the Fountain
第五章 过程 Chapter 5 Procedural aha!
十五的技巧 Fifteen Finesse
关于河马的难题 Hippo Hangup
分配家务 Dividing the Chores
杂技扒手 The Crooked Acrobat
飞机坠落于小岛 Island Crackup
懒惰的朋友 The Lazylover
外科医生 Sanitary Surgeons
第六章 文字游戏 Chapter 6 Word aha!
W. O. 沃德尔博士 Dr. W.O. Wordle
西·李·霍 Shee Lee Hoi
无从捉摸的“八”(EIGHT) Elusive Eight
世界上最小的纵横字谜 World's Smallest Crossword
玛丽·贝尔·拜伦 Mary Belle Byram
画谜 Picture Puzzles
滑稽的句子 Crazy Sentences
可笑的名字 Nosmo King
方卡片中的家谱 Square Family
酒馆的招牌 Tavern Tease
隐蔽的符号 Cryptic Symbols
镀金的模型飞机 Gold Tuitt
弗罗·斯特菲 Flo Stuvy
奇妙的字母序列 Curious Sequences
最后的话 Parting Words
Selected References
答案 Answers to Posed Problems
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