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The Slide Rule
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

Pentagonal Tilings
Octagonal Tilings
Dodecagonal Tilings
Heptagonal Tilings

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

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
Special Bonus Section:
Introduction to Geometrical Optics

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


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


Board Games Other Than Chess
A Few Board Games of Interest
Comments on Wei Ch'i (or Go, or Baduk)

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
The Jungle Game

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!)
Patterns in Nature and Myth

A Note on Large Numbers
A Unified Architecture for Telephone Numbers
On Philosophy and Ethics (Recent Additions!)