Each year, a chart circulates online purportedly showing Google search trends for "super bowl" and "how to read roman numerals" in lock-step with each other, peaks lining up every Super Bowl season.

Roman numerals chart. This year's Super Bowl is fairly simple to understand, but some numbers can seem a little complicated at first. Here's a handy chart to help understand which numbers match ...

Roman numerals get nine by putting I, which equals 1, before X, which equals 10, to essentially indicated 10-1=9. For comparison, when I appears after X, as in XI, that indicates 10 + 1, which ...