This One Tiny Manicure Tweak Will Give You Better Nails and Longer-Lasting Polish

Besides the obvious—don't pick your cuticles or bite your nails, apply hand cream religiously, don't saw a file back and forth—there's one tip for better, healthier nails you may be missing. And it involves a little bit of trigonometry. Don't worry, you won't have to chart triangles or anything, but you will need to brush up on your angles.