ATLANTA, Georgia (CNN)-- Dr. Jodi Greenwald, a pediatrician in Roswell, Georgia, has a secret weapon for helping children cope with pain. It's not a drug. It's not a medical device. It's a pinwheel.

You may have seen on social media different versions of the so-called "five-date rule." Before you take five, so to speak, and follow it, consider its rationale and limitations.