Cuticle wax is a solid oil, and is just as susceptible to the diatoms' charms as any other oily substance.

ECONOMIST: Pest control

"You get the cuticle protected for a longer time, " Dr. Pichardo-Geisinger says.

WSJ: Old Hair Days: Products to Help Manage Gray and Thinning Hair

Gently pull back the cuticle, and really scrub the nail, not just wipe them, with a cleanser.

FORBES: 5 Celebrity Beauty How To's From Eyebrows To Updos

This layer, called the cuticle or bloom, is still wet when the egg emerges, but quickly dries after a few minutes.

FORBES: Natural Protection