It's the place to look for the plumber's phone number, the date of the next doctor's appointment, that photo from your summer vacation and the spelling test your kid aced last week.
Yet even for all these telling glimpses into the minutiae of daily life, your refrigerator door reveals much more about your middle-class family.
The sheer volume of objects clinging to it may indicate how much clutter can be found throughout your home. Furthermore, that clutter provides a strong clue to how much stress Mom feels when she walks through the door at the end of a day at work.
This is one of the juicy tidbits from "Life at Home in the Twenty-First Century: 32 Families Open Their Doors," the first book by researchers affiliated with UCLA's Center on Everyday Lives of Families