Now Allergan, maker of Botox, wants to spread fear of "brow furrow"--age-related vertical lines between the eyebrows--to middle America.

FORBES: Smooth Operator

Davidson, director of the Center for Investigating Healthy Minds at the University of Wisconsin, says he is exploring whether activating the frowning muscle between the eyebrows, known as the corrugator, is associated with activity in the amygdala, the part of the brain that processes emotions such as fear.

WSJ: Stress-Busting Smiles

The folds were red and swollen so I couldn't really tell if it looked different or not, but the line between my eyebrows was gone.

FORBES: Going Under The Needle

He did the same thing on the other side of my face and then injected the filler into two spots between my eyebrows. (There must not be many nerves there, as he skipped the lidocaine and it didn't hurt.) I was done in less than five minutes.

FORBES: Going Under The Needle

This raised eyebrows in Pakistan where the links between the militant and social welfare wings of some groups are often not clear.

BBC: Profile: Hafiz Saeed - Pakistan's $10m 'bounty man'

When he opened his eyes the new girl was leaning over him, two lines between her eyebrows.

NEWYORKER: Ziggurat

It was his mother who brought the last beers to the table, and for the first time in his life he could see between her furrowed eyebrows a disdain for those she served.

NEWYORKER: Ghosts

He thanked me for being brave enough to do this in front of an audience, and explained that he planned to partially fill in the nasolabial folds (the lines that look like parentheses between the nose and mouth) and a couple of creases between my eyebrows.

FORBES: Going Under The Needle