Want to know more about the cool math concepts on your lip balms?

PI
Pi (written with the Greek letter π) is one of the most well-known mathematical symbols out there. It's the ratio between the circumference and diameter of any circle, but pi is used everywhere! In math, in physics, in engineering, pi plays a role in our everyday life. It's an irrational number, so it is a non-repeating decimal with infinite digits (most people know the beginning: 3.1416...but how many numbers of pi do you know?). It's also a transcendental number (if you want to know more about that, you'll have to read about it here—it transcends the ability to explain it simply here).
IRRATIONAL NUMBERS
Irrational numbers make up the majority of real numbers. They can't be expressed by a simple fraction (aka integer ratio). For example, pi, Euler's Number, the Golden Ratio, and the square root of two are all irrational! When written as a decimal, irrational numbers don't terminate or repeat in a regular pattern…they just go on and on.
GOLDEN RATIO
Known as the Golden Ratio or φ, this mathematical concept appears many times in art, architecture, geometry, and nature itself. While it can be expressed algebraically, it is often better understood geometrically with a shape known as the golden rectangle. This irrational number can be found represented in the leaf patterns of some plants, the spiral on certain types of shells, and more. This is an especially cool article on the Golden Ratio and nature.
INFINITY
As you probably know, infinity is the mathematical concept that there is no end. It isn't actually a number—it's simply an idea. It can't grow, can't be measured, and can't really be accurately portrayed. And it's worth noting: even though you can measure the cardinality of set of infinite numbers, it's mathematically impossible to go beyond infinity. But don't tell Buzz Lightyear—we'll just keep that between us math geeks.