# Chronology of Updates

**Note**: I have placed chronology of updates for 1996, 1997, 1998, 1999, 2000 and 2001 into separate files. Starting with 1997, the most recent entries appear topmost. Besides providing an insight of this site's evolution, chronology updates may be used for word searches.

December 30, 2002 |
Medians in a Quadrilateral |

December 27, 2002 |
Shimmer Illusion |

December 26, 2002 |
Twisted Cord Illusion |

December 25, 2002 |
Zöllner's Illusion |

December 24, 2002 |
Clifford's Lemma |

December 22, 2002 |
Sorting Algorithms |

December 15, 2002 |
Height/Width Interplay Illusion |

December 14, 2002 |
The Complete Quadrilateral |

December 13, 2002 |
Hering Illusion |

December 3, 2002 |
Do You Speak Mathematics? |

December 2, 2002 |
Necker Cube |

November 30, 2002 |
Circular Poggendorff and Orbison illusions |

November 29, 2002 |
Bulging lines illusion |

November 28, 2002 |
Assimilation Illusion |

November 22, 2002 |
Bender: A Visual Illusion |

November 16, 2002 |
Optimization Problem in Acute Angle |

November 15, 2002 |
Heron's Problem |

November 13, 2002 |
Math Card Trick by Eric Shrader |

November 6, 2002 |
A Geometric Limit |

October 26, 2002 |
Gergonne and Van Obel Theorems |

October 14, 2002 |
Pythagorean theorem, Proof #40 |

October 2, 2002 |
One Pile Games |

August 3, 2002 |
Circle Crosses Triangle |

July 25, 2002 |
Two Butterflies Theorem |

July 23, 2002 |
Parahexagon and Paragon |

July 15, 2002 |
Pascal Lines: Steiner and Kirkman Theorems |

July 12, 2002 |
Napoleon's Propeller |

July 5, 2002 |
Periodic patterns in sin(N) |

June 29, 2002 |
Area of Parallelogram |

June 16, 2002 |
Butterfly Theorem |

June 12, 2002 |
Concyclic Circumcenters: A Sequel |

June 5, 2002 |
Orthopole |

May 25, 2002 |
Dynamic Construction of Ellipse and Other Curves |

May 24, 2002 |
Proof #39 of the Pythagorean theorem |

May 23, 2002 |
Concyclic Circumcenters: A Dynamic View |

April 26, 2002 |
The Puzzlers' Pigeonhole |

April 19, 2002 |
Similarity and the Parallel Postulate by Scott E. Brodie |

April 10, 2002 |
Determination of p |

March 26, 2002 |
A Scrub Tile Puzzle |

March 25, 2002 |
Angle Trisectors on Circumcircle |

March 24, 2002 |
Of Looking and Seeing |

March 4, 2002 |
Circles in Morley's Triangles |

February 28, 2002 |
Peg Solitaire and Group Theory |

February 22, 2002 |
Student's Social Choice |

January 12, 2002 |
All Peano Curves |

January 9, 2002 |
The Constitution and Paradoxes |

January 8, 2002 |
Odd Coin Problems by Jack Wert |

January 7, 2002 |
Started the Social Science section at the Interactive Activities page |

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