Should I stay, or should I go?

This is the eternal question every Londoner (or any urbanite) faces:

You've missed the bus- do you walk to the next stop to try to catch it, or do you stay put and wait for the next one to come along?

There is a precise mathematical equation that can be used anytime you're faced with this dilemma:

The long and short of it is, if you walk to the next bus stop- chances are the bus will pass you by, and you'll end up waiting even longer...so stay put.

You can read the full proof here, Walk versus Wait: The Lazy Mathematician Wins, if that's your thing.