Two mathematicians have proved that a straightforward question—how hard is it to untie a knot?—has a complicated answer.

1. Fast and Slow Piles. This works well as a starting or closing activity. Students sort math fact cards into fast and slow piles. This visual way of tracking facts highlights which facts come ...

Faith and formulas might not sound like a natural pair—but for Sr. Catherine, they’re deeply connected. Through her math lessons at St. Charles Borromeo School, she’s sharing how God is reflected in ...

A ratio of debt to equity is calculated by dividing total debt by the amount of shareholders' equity, found near the bottom ...

The interstate system isn’t random. Odd roads run north-south, while even run east-west. But there are a few exceptions and ...

Under the revised format, the five highest-ranked conference champions are still guaranteed a place in the playoff field, ...

High-quality takers and aerial threats do the heavy lifting going forward. It’s time sides were braver in opponents' ...

This 180-sided object cannot fit through another like it, no matter where you bore the hole or how you tilt it.

Hanging out or working on set for a movie or TV show is so much fun and a privilege for all who get to do it. So when it ...