Dior has just debuted the latest in high-tech mascaras, and like the vibrating and ball-shaped mascara wands before it, this new modification is sure to launch scads of imitators. The new mascara, DiorShow 360 ($36), carries quite the price tag but promises that its double helix-shaped bristles and spinning wand will "mimic a makeup artist's application technique for a perfect 360-degree lash-styling effect." That's a pretty tall order for any product, and to be honest, I was a little scared of putting something spinning (and perhaps lash-pulling) next to my eye. I tried it anyway, though. So get ready to see whether the spinning helix brush is worth its weight in gold.