How many of you have cable locks hanging out in the garage, safely locked but unusable because you just cannot remember the numeric combination? We counted three ourselves ... we haven't gotten rid of ...

Some numbers — like the phone number of that jerk who dumped you in 11th grade — stick in your head for all eternity. Other numbers — like the combination for the padlock on your tool shed — don’t.

I have a hard time remembering numbers. I frequently forget my PIN. If I really, really like you I might remember the month or day of your birthday, but never both. I’ve forgotten the code to every ...