*[We have been talking a lot about the speed of light, which is a constant value.]*

Are there other mathematical constants?

*Yes. There’s a cool one called ***pi** that helps us figure out the circumference and area of any circle. Would you like to do some work with it sometime?

YES YES BRING ME THE CONSTANT PIE!

*[Later]*

*Pi is also cool because it goes on forever. You can’t write it as a simple fraction – its decimals go on forever if you don’t round it – which, clearly, you have to at a certain point. That’s called an irrational number.*

CONSTANT ENDLESS PIE! YUMMMMMMMM

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