Discovering she was in that group of women who are ER-negative, wasn't.

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You would not give your Gold Amex to a stranger in the street, so don't e-mail its numb er to any old website.

CNN: CAVEAT SURFER

If "Pediatric Emergency Department" doesn't show up under "type of services, " that means there isn't a "kid-certified" ER in your area.

CNN: How to find the best ER for your child

Likewise, your wife's best friend who's into entertaining, or decorating, can't necessarily run a hotel, nor can your ne'er-do-well nephew or brother-in-law who needs a job.

FORBES: What Does It Take To Start A Hotel?

"It is always, always better to call the pediatrician before going to the ER for anything but life-threatening emergencies, " injuries or conditions that, if they didn't get medical attention, could result in death, says Lara Zibners, M.

CNN: 10 common kid health emergencies and what to do

And many electric utilities have facilities that create hydrogen power, but consumers can't just pull in with a fuel-cell vehicle and say, "Fill 'er up!"

FORBES: Fueling Hope

About half of children who go to the ER with head injuries get this radiation-heavy scan, and clinical observation first could help some who don't really need a CT avoid it.

NPR: Doc Groups Issue List Of Overused Tests, Therapies