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Distance to the horizon Orbital velocity Shooting the monkey Barometer Dissect the square Dissect triangle, pentagon, 6-gon Dissect the circle Paper dodecahedron The other paper dodecahedron Fold a pentagon, triangle, 6-gon Construct a pentagon Heavy boots All angles are right Flipping covers A hundred boxes Witches of Salem Maximising product of heap sizes Sum of the Squaws The Knight Returns

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

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

Distance to the Moon Rope around the Earth The other rope around the Earth Infinitely many semi-1 numbers?

Hungarian Race Track Von Neumann and the fly The two inch hole Proof via Archimedes

Pythagoras by fish tank Stone the crows Flipping ice cream cake Wilson's theorem