Cool proofs, facts, objects
Physics / Calculations
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Games
- Drommels (via Fred Horn)
- Parallelograms (via Fred Horn)
- Product
- CoNeutron
- X-only TicTacToe
Puzzles
- Assassins
- Circle dissection
- 12 face fully symmetric solid (via Nick or John)
- Flipping Ice Cream cake (via John McLeod)
- Set of sets of N, sum = 20, product maximum
- Four coins to line, six coins to hexagon
- 2 = 4
- Hole in disk : dissection
- Rotation, Reflection, Translation
- 2 of 1 kg balanced
- Peter Higgins' friend's daughter
- Josh's polynomial problem
- 10x10 board, 41 rooks, find five that don't attack
- Maximise volume of cuboid if Length + circumference = 100
- Tile 8x8 with 2x1, is there necessarily a 2x2?
- Three litre, five litre
- 1, 2, 5, 10 minutes - limit of 17
- My oldest plays the piano
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