Sudoku is a number-based puzzle game. The aim is to fill the 9×9 square grid using all of the numbers one to nine only once in each row and column, and within each of the smaller 3×3 grids. Players ...

The Earth is always spinning on an imaginary line called an axis. This line goes through the North and South poles. We call this spinning, rotation, and it takes about 24 hours for the Earth to make ...