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- A+B=C
- Hats 0 to n-1, someone to be right
- Perrin
- Product of chords
- Counting bounces
- Pythagoras by incircle
- Astronaut in a sphere
- Coins to make hexagon
- Coins to make straight line
- Brownian, (0,1) -> (<1,0) prob?
- Tethered to perimeter, graze half?
- Sqrt 2 not in Q. n^th root neither
- Mutilated chessboard
- Thirteen piles of four.
- Three integers in a.p. whose product is prime?
- Integer whose English name is alphabetical?
- Lifting the rail track
- Curve versus triangle
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- Infinitely many composites
- Shoelaces - knot theory
- sin t + a cos (t+c) is still sin
- Product of sum of squares still
- Half integer rectangles
- Pythagoras generalised
- Non- crossing Euler.
- Bi-colour Jordan curves.
- Complex proof of Pythagoras
- Unstable quadratics
- Why is A4 210x297 ?
- Area by cutout and weigh.
- Percentage wine in water.
- Tower of a's
- Lanchester's laws
- Rock in boat in swimming pool
- helium balloon in car
- Cars across the desert
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