Sudoku is a logic-based number puzzle played on a 9x9 grid, divided into nine 3x3 subgrids. The goal is to fill the grid so that each row, column, and 3x3 box contains the numbers 1 through 9 exactly ...

Five years ago, mathematicians Dawei Chen and Quentin Gendron were trying to untangle a difficult area of algebraic geometry involving differentials, elements of calculus used to measure distance ...

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Happiness is an electrifying and elusive state. Philosophers, theologians, psychologists, and even economists have long sought to define it. And since the 1990s, a whole branch of psychology—positive ...