Mathematical Circus
Finiteness in the Card Game of War
Fusible numbers and Peano Arithmetic
\"Integral Milking:\" Does anyone else do this?
Five Points in Square Lattice
SOLUTION: Suppose 5 points with integer coordinates are chosen at random from the xy-coordinate system.
edpegg/CutTheKnot-Java: Java code from https://www.cut-the-knot.org/ written by Alexander Bogomolny
ghewgill/puzzles: Simon Tatham's Portable Puzzle Collection