Loss of density makes hair harder to style because the hair doesn't support itself as well, says Kevin Mancuso, creative director at Nexxus.

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

One side of the silicon can then be etched down to within a fraction of a hair's width of the glass layer, leaving the other side as a support.

ECONOMIST: Chip technology

Hair salon operator Regis Corporation ( RGS) is trading a bit higher Thursday after the company encouraged shareholders to support it against investor Starboard Value late yesterday.

FORBES: Beauty Industry News: Sally Beauty, Regis