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Mathematics: The Slide Rule Infinity Archimedean Solids The Fourth Dimension Rotations of a Dodecahedron Examples of Groups Two Famous Equations Euler's Constant Sphere Packings Gödel's Theorem and the Halting Problem Magic Squares The Mandelbrot Function Diophantus at the Printer's Shop Tilings Pentagonal Tilings Octagonal Tilings Dodecagonal Tilings Heptagonal Tilings Calendars: Perpetual Calendars A Luni-Solar Calendar A Simplified Calendar Proposal Julian Day Numbers A Martian Calendar A Modest Proposal for the Abolition of the Leap Second Happy Easter! Happy Hanukkah! The Mayan Calendar	Science: A Space Habitat Design Travel to Mars Lining up the Planets The Equation of Time The Einstein-Podolsky-Rosen experiments The Fine-Structure Constant Punctuated Equilibria Telescopes and Eyepieces: How a Telescope Works Kinds of Telescopes Telescope Mountings Eyepieces Special Bonus Section: Introduction to Geometrical Optics Chess: Comments on the Rules The Immortal Game (Anderssen-Kieseritzky) Dynamic Scoring Leaping Bat Chess Random Variant Chess Three-Dimensional Chess Engagement Chess Five-Player Chess Four-Player Chess An Unusual Board for Three-Player Chess Spectral Realm Chess Half-Shogi Chess Temporary Marsellais Chess Antimatter Universe Chess An Ordinary Variant Well-Known Forms of Chess Traditional Enlarged Forms of Chess Warring States Chess The Game of the Three Kingdoms Hexagonal Chess Hexagonal Chess, Part 2 S. Waider's Chess for Three Players Enlarged and Improved Chess	Computers: How Does A Computer Work? What Computers Are Made From Computer Arithmetic The General Layout of a Computer The Old Days: Computing Without RAM The Old Days: Decimal Computers A Computer Architecture: Memory-Reference Instructions Additional Instructions Basic Architecture Restricted Functionality Off-Chip Processing The Perfect Computer? Not Quite RISC A Historical View of FORTRAN Remembering APL Computer Keyboards Keyboard Scan Codes About a Computer Language (EXALT, see below) Computer Architectural Preferences Computer Front Panels The Punched Card Print Train Trivia Printing Terminals and Proportional Spacing Digital Magnetic Tape Recording Reforming ASCII and Unicode Introduction to EXALT
Signal Flag Systems The Vocalization of Hebrew Introduction to HTML Color Charts The Musical Scale Building Blocks and the Pythagorean Triangle Efficient and Flexible Text Encoding Design for a Tall Building Movie and TV Aspect Ratios A Limitation of Color Photography Color Filter Array Designs Unit Conversions	Miscellaneous: Board Games Other Than Chess A Few Board Games of Interest Comments on Wei Ch'i (or Go, or Baduk) Checkers Two-Move and Three-Move Restrictions The Perfect Game? (New!) Other Forms of Checkers Hasami Shogi, Seega, and Other Related Games Ludus Latrunculorum English Gothic Double Checkers Other Uses for a Go Board The Greatest Modern Board Game of Skill Backgammon The Jungle Game Rithmomachy The Perfect Game? (New!) Making Wargames More Complicated Making Full Use of Three Ordinary Dice The World is Round Making Board Games More Complicated Space Battles in Three Dimensions The Real Game of Bridge Siberian Semi-Contract Whist (or Bridge) Bridge for Six: Trivial Whist Counting Tricks Before They're Hatched The Semi-Tarock Deck	Don't Touch That Dial! Color Television Madness Four Speakers from Two Channels? A Problem in Applied Geometry A Phonemic Alphabet Two Schemes For Elections (New!) Probability Patterns in Nature and Myth A Note on Large Numbers A Unified Architecture for Telephone Numbers On Philosophy and Ethics (Recent Additions!)