Did you know there are more ways to shuffle a deck of cards than there are atoms in the universe? Seems crazy, but it's true.

Mehtaab Sawhney, who joined Columbia last year, enjoys the thorny work of proving a seemingly straightforward statement of ...

History worksheets have been one of our favorite ways to make the past feel real. Whether we’re learning about U.S. presidents, ancient wonders, or cultural celebrations, having something hands-on ...

"This is breaking knowledge into true number theory which is ABSOLUTELY appropriate for first grade and SHOULD be the focus of math at that age." They continued: "In fact should be taught on a ...