All circles, from onion rings to Saturn’s rings, share a magnificent property: their circumferences stretch about three times longer than their diameters. To be more precise (though still not exact), ...

Does the date March 14 ring a bell with you? Best known as Pi Day, 3/14 is the celebration of the number that begins with 3.14159 … and never ends. Pi (π) is the ratio of a circle’s circumference to ...

Time is a flat circle, Matthew McConaughey tells us, neglecting to explain how then we could measure time's circumference to derive its diameter, using pi. (Maybe it's best not to take the sentiment ...