Makeup house Lancome has a new nail polish called "Le Magnetique" which is infused with metallic particles. Before the second coat of varnish dries, holding the bottle's built-in magnet over your nails will align the particles in a star-shaped pattern familiar to anyone who has played with magnets and iron filings.
That is how you do nerdy products for women! (Or, yes, men who wear nail polish.) Who gives a rat's ass about a pink product when you can get one with extra science?
Rumor has it that this is available at Nordstrom for $17, but I didn't see it on their website. You can buy it on eBay, but it's 44 bucks, which is a bit nutso.
Glamourous Nails with Lancome Magnetic Nail Varnish [Coolest-Gadgets via (the charming) All Lacquered Up]