| Date | Subject |
|---|---|
| October 6, 1994 | Pudgiest Mobius band |
| October 11, 1994 | Pudgiest Mobius band |
| November 13, 2002 | seven |
| December 3, 2002 | Square (& other) chains and necklaces. |
| December 3, 2002 | infinite paths & cycles |
| December 9, 2002 | Clarification and correction |
| January 16, 2003 | Copyright extension |
| July 14, 2003 | Marilyn Vos Savant again ????? |