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Puzzle #2 in our 2020 Christmas puzzle series
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Try out these flo-maps for yourself: fractions speak louder than words
The Hidden Half
We review the ninth of this year's nominees for the Book of the Year
Topological tic-tac-toe
Alex Bolton plays noughts and crosses on unusual surfaces
Roots: Pythagoras of Samos
Pythagoras gave us so much more than a² + b² = c²
Puzzles on square grids
How to make Sudoku more interesting