The Fibonacci sequence works like this:
0, 1, 1, 2, 3, 5, 8, 13, 21, 34, 55 . . .
You add two numbers to get the next number in the sequence (as in 2+3=5), then you add that number to the previous number in the sequence to get the following one (3+5=8), and so on. Greg Ross at Futility Closet explains that this sequence lets you convert miles to kilometers, where 8 miles equals 13 kilometers, 13 miles equals 21 kilometers , etc. Greg explains that this works because "the two units stand in the golden ratio" -- approximately 1.6180339887. But the great thing about it is, even if you don't understand HOW it works, you can still use it. Like your computer or your car. And when I say you I mean me.