Fermat—most famous for his mysterious “ last theorem ,” which vexed experts for decades—contributed all kinds of useful ...

A seemingly simple math problem about dividing pizzas sparked debate when someone highlighted a potential flaw in the assumed answer.

The Switch Pro Controller -- a $70 add-on for Nintendo's new console that lets you play Zelda with the form factor of an Xbox gamepad -- hides a secret message. It's nothing subversive or anything ...

Read receipts are a quick way to let people know you saw their text. But sometimes you may not want them to know. Here's how to turn them on or off for everyone or for specific people.