Physicists have uncovered a hidden connection between a famous 350-year-old mathematical formula for *pi,* everyone’s…

Here's a weird little corner of the internet for you to devour. YouTube user Crysknife007 is well-known for…

The new Raspberry Pi is smaller, cheaper and more energy efficient—not a bad way to update a best-selling device.…

We all know pi, at least the first three digits of it. If for some reason you forgot them though, there's good news.…

Cristian Ilies Vasile has created the coolest visualization of Pi I've seen. First he divided a circle in 10…

Recreational *mathemusician* Victoria Hart—aka Vi Hart—gives overwhelming (and fun!) evidence that clearly…

Pi is for planets, and spacecraft, for orbital dynamics and craters. It's 3.14, and it's all about circles.

A great deal of time has been spent working out the facts about pi. At one point, the "facts" were wrong. And a…

Martin Krzywinski is an artist. No, wait, he's a mathematician. Actually, scratch that: he's both, and he can make…

The latest episode of Numberphile delves into a particularly interesting reference to pi from the *Simpsons* episode "…

Unless, that is, you're a synesthete. (You're about to experience a number through music!)

Do you feel like having a once-every-thousand-year party? You only have a couple of years to set it up. Some of us…

We may be celebrating Pi Day here at io9, but we would be irrational to deny that there’s more to mathematical…

When an amateur mathematician from Indiana managed to solve one of mathematics' great problems—squaring the…

Pi is famously calculated to trillions of digits—but how many of them do we really, *really* need? This video…

How many numbers of Pi can you rattle off? Probably not many. Probably even fewer if you're drunk. But you can at…

Any eyes in San Francisco that weren't focused on Apple's announcements yesterday might have noticed something…

Pi is what's known as an irrational number, which means that its decimal representation is both infinite and…

Pro-tip on pi-tips: this will come off as even more clever if you actually ordered pie. Or a pi pie.

It's Pi Day! Which, okay, whatever, if you were really hardcore about celebrating you'd figure out what nanosecond…