I had a fascinating chat with brow guru Kristie Streicher (clients include Emily Blunt and Mandy Moore) on my recent trip with Mary Kay to Blackberry Farm. I’ve assumed for years that my thin(ning) brows were the result of DNA. So, I’ve become fairly adept at using a pencil to fill in sparse spots—and have come to (mostly) accept that anemic arches are just one of my lots in life. Turns out, this may be wrong.