Boing Boing on MSNOpinion

Two twisty doughnut shapes solve a 150-year-old geometry puzzle

In 1867, French mathematician Pierre Ossian Bonnet proved something that seemed like common sense: if you know how far apart ...
Edutopia

4 Ways to Bring Logic Puzzles Into Your Math Class

Take the pressure off of problem-solving with engaging thinking games that encourage students to work together to find ...