Laura Miller’s first act of anonymous kindness was placing a single lavender hydrangea bloom on the windshield of a stranger’s car in July 2009. Ever since, Miller has left a trail of small favors for unsuspecting residents of Pittsburgh. Nothing expensive, but delightful nonetheless: Starbucks gift certificates, uplifting messages, rolls of quarters, and other treats. “If I had the money, I would do it every single day,” says Miller, who recently revealed her identity at a fund-raising party, helping to attract other well-wishers to the effort. She now counts more than 1,600 people across the world in her cause for kindness. “It sounds dramatic, but I wish for a world where we all take care of each other,” says Miller.