Have you been searching for a gem-hunter's kit? A solar-powered model biplane? An ant factory, a hand-held metal detector, or ingredients to brew your own root beer? You have? Then breathe easy. Dr. Einstein has blown into town. Or rather his namesake, this toy store, has arrived. With a terrific selection of scientific, ecological, and mathematical games and experiments, Dr. Einstein's ranks as a good idea that borders on genius. Of course the shop's location in Miami's hookerville is a little weird, but it beats all those other mall-rat-infested stores and toy shops in the area. And there's more to attract you to this place than just the educational fun a kid can have assembling his own robot. You won't find Tickle Me Elmos or Furbies, or even Teletubbies. Take that, Tinky Winky.