The North Vietnamese soldiers and the communist Pathet Lao soldiers could not and would not tell the difference: Hmong was only skin deep.

NPR: Excerpt: 'The Latehomecomer'

This number is exceedingly small, and shows that the superficial features, which we often think of as defining human ethnic groups, are literally only skin deep.

BBC: What is anthropological genetics?

Uncertainties abound, and 3G's seductive power may be only skin deep.

CNN: Stuck On the Runway

At one point, Myhrvold asked the surgeons what, in a perfect world, would make their lives easier, and they said that they wanted an X-ray that went only skin deep.

NEWYORKER: In the Air

The level of the designer's participation varies, too: In some projects it's only skin-deep, but in others it extends down to faucets.

FORBES: The Glamour Factor

While these individual romantic choices may have played some role in the challenges the young women faced, the focus on boyfriends and husbands is only skin-deep.

FORBES: Bad Relationships Don't Stand in Poor Women's Way. Bad Policies Do.

The similarities between Brazil and Argentina are only skin-deep.

ECONOMIST: First it was Argentina. Will Brazil be next?

Yet its immunological nature is only skin-deep.

ECONOMIST: A thousand ills require a thousand cures