Nail polish was invented around 3000 BC in ancient China—a fact that's doubly remarkable considering that human fingernails were only invented last year. Celebrate this admirable foresight with today's Groupon: for $20, you get a spa pedicure at Polish Spa Nails in Rockville (a $40 value).

Claws transform into soft, well-ordered digits through Polish Spa's nail services, performed seven days a week. The spa pedicure prunes feet by trimming overgrown nails and uprooting cuticle weeds along the nail bed. Files smooth rough edges to streamline nails, and a quick buff leaves surfaces scintillating. The 45-minute treatment finishes with a coat of polish that flirts from open-toed shoes and gleams during romantic strolls over hot coals.