In the coming decades, the great American political debates will be less and less likely to feature Franklin Roosevelt-style Democrats squaring off against Ronald Reagan-style Republicans. Although ...

Researchers have developed an efficient way to characterize the effective many-body Hamiltonian of the solid-state spin system associated with a nitrogen-vacancy (NV) centre in diamond. The technique ...

No, not that Hamilton. I meant William Rowan Hamilton, the nineteenth century Irish mathematician. And not that sort of grid. I meant a square grid, like a chessboard or a Sudoku. Today’s two puzzles ...

Earlier today I set you two puzzles based on Hamiltonian paths in a square grid. A Hamiltonian path is one which visits every cell exactly once. (If you want a print out of the puzzles, click here.) 1 ...