Pi Day (March 14) is a day of global mathematical celebration, but it’s not the only numerically significant calendar date. It’s far from the rarest, either. In fact, today marks a special occasion ...

For over two millennia, mathematicians agreed on one thing: you can’t use trigonometry to prove Pythagoras’ Theorem—because trigonometry is built on it. That logic, drilled into students and scholars ...

It’s the theorem every mathematician believes in — yet no one can prove it. For decades, the brightest minds have tried and failed to explain why something so clearly true sits forever beyond reach.