Build 14 Bridges
Puzzle
Game
Recreational Math
The puzzle is strongly related to the number 14.
The trick is based on a pythagorean triple.
The size of the puzzle is about 10cmx10cmx2.5cm, and it is made by MDF.
Goal: Put all bridges on the board.
G4G14
Ryuhei Uehara
Tomoko Taniguchi
G14-021
C.L. Dodgson (Lewis Carroll) Oxford Mathematician
Recreational Math
Word Play
Lewis Carroll, the nom de plume of the Rev. Charles L. Dodgson, a mathematics lecturer at Oxford, was also an innovator in recreational mathematics, magic, puzzles, cryptography, and inventions. His appearances in Scientific American began with mathematician Warren Weaver’s article in April 1956, and his name is mentioned over a hundred times in fourteen of Martin Gardner’s “Mathematical Games” columns. Using these as a springboard, topics will also include Carroll himself, the Wonderland/Looking-Glass dyad, Gardner, and their intertwining in The Annotated Alice.
G4G14
Mark Burstein
Stan Isaacs
Stuart Moskowitz
G14-056
Can the Number of Pieces in a Rectangular Jigsaw Puzzle be a Multiple of the Number of Edge Pieces
Recreational Mathematics
Douglas Hewitt
G4G14 Gift Exchange Book
G14-P023
Catenate: An Innovative Card Resource Game
Games
Jay Schindler
G4G14 Gift Exchange Book
G14-P013
Celt Decision Maker
Magic/Illusion, Game, Toy, Science
This wobbly spinner also called a "rattleback" features a physics defying unpredictability. Which makes it perfect for equally unsure decision making. Includes one 3¾" long rattle back and one 4½" wide decision disc.
Kenneth Brecher
Circle Square Illusion Templates
Recreational Mathematics
David Richeson
G4G14 Gift Exchange Book
G14-P034
Conspiracy Theories
Science
Robert Crease
G4G14 Gift Exchange Book
G14-P067
Conway's Game of Life
Conway’s Game of Life needs no introduction to fans of Martin Gardner. Numerous examples exist in which a GoL “spaceship” object sends out smaller objects (“gliders”, etc.) that move away from the generator at a constant speed. That speed is set by the underlying nature of the GoL’s generations, because each such object can move no faster -- generation to generation -- than the unit distance built into the GoL model itself. In fact, the maximum such speed of propagation is called c or “the speed of light” in GoL terminology. In a typical computer running a GoL in a lab, the unit of time in the GoL of course has no fixed relationship to the unit of time marked on the lab’s clock on the wall. If the lab personnel were to double the rate of GoL generations (relative to the clock on the wall), the speed at which a GoL glider moves across the screen is also doubled (relative to that clock), but within the GoL universe itself, there is no change in speed.
G4G14
Nathaniel Johnston
Dave Greene
G14-027
Cube-it Puzzle
Puzzle
9 loose square wafers of plastic with a hole in the center of all but one that has a cylindrical pin. It is clear that the wafers can be stacked on the pin. 7 of the wafers have notches of various size in the edges. There are no hints included. Each wafer can be flipped or rotated in 4 positions in relations to each other and can be in one of 8 positions on the stack. The goal is to find out what it is.. and I'm not telling! The puzzle is 3d printed in white PLA, using two Creality CR10S printers. It was designed using Rhino and sliced using Simplify3D.
G4G14
Craig Newswanger
G14-013
Custom Zometool Struts
Puzzle
3D printed custom Zometool struts, and a Zometool ball.
G4G14
Aaron Siegel
Scott Vorthmann
G14-007
Dear Mister Gardner: Apocryphal Letters from Children to Martin Gardner
Legacy
Rodi Steinig
G4G14 Gift Exchange Book
G14-P040
Does Conway's "Game of Life" Predict that the Speed of Light is Constant in the Real World
Science
Jim Weinrich
G4G14 Gift Exchange Book
G14-P069
Domino Steganography: Dracula + (-Dracula) = Frankenstein's Monster
Art
Robert Bosch
G4G14 Gift Exchange Book
G14-P002
Eastern Forest Playing Cards
Game, Art, Word Play, Science
Text by: David G. Haskell,
Illustrations by: Ellen Litwiller
Dan Buck
Engel Doug Unity - Ring & Puzzle Card & Superposition Paper
Puzzles
Douglas Engel
G4G14 Gift Exchange Book
G14-P044
Entropy
Puzzle
Sudoku with some added rules. This puzzle can only be solved in conjunction with the gift "Palindromes" by Elizabeth Gallagher.
G4G14
Neil Calkin
G14-009
Fibonacci Turbine and Cone-Puter for Cone-tined Fraction by Cone-pass
Science
Akio Hizume
G4G14 Gift Exchange Book
G14-P068
Flippe Top
Toy
This document describes how I designed a new kind of top, which flips not just once, but over and over. I call it a "flippe top". It can be made either from wood or by 3D printing.
G4G14
George Bell
G14-035
Flippe Tops
Science
George Bell
G4G14 Gift Exchange Book
G14-P065
Four Bar Ellipse
Toy, Rec Math, Science
This mechanism demonstrates a surprising way to generate an ellipse by using a four-bar linkage. The shape of the ellipse can be defined by the path the intersection point of the two crossing bars follows. This fact is analogous to another neat way to make an ellipse with two fixed foci and a string of fixed length attached to them.
Alexander Kernbaum
Free the Pearl
Puzzle
Applying the planar puzzle mechanism of the Magic Disc puzzle to a three-dimensional form yields an interesting and challenging coordinate motion puzzle.
Bruce Patterson
G4G14
John Partridge
G14-008
G4G14 Exchange Gift (Martin Gardner Magic Trick)
Magic
Recreational Math
Legacy
We, on behalf of ThinkFun, would like to submit a physical gift based on a personal letter sent from Martin Gardner to one of our founders, Bill Ritchie, in 1994. We will submit photocopies of the letter, which describes how to perform the magic trick. We will also include the pieces needed to perform the magic trick.
G4G14
Bill Ritchie
G14-032
Gathering for Gardeners: A Randomized Approach to Pattern Formation
Recreational Mathematics
Dana Randall
Shunhao Oh
G4G14 Gift Exchange Book
G14-P033
Generalization of Cone-pass and Continued Fraction: Cone-puter
Recreational Mathematics
Akio Hizume
G4G14 Gift Exchange Book
G14-P025
Golomb Rulers
Recreational Math
A perfect ruler for daily use. In mathematics, a Golomb ruler is a set of marks at integer positions along a ruler such that no two pairs of marks are the same distance apart.
G4G14
Qingqing Mao
John Bohannon
Yuan Mei
G14-036