Junior scientists will find ample opportunity for discovery while studying comets, dinosaurs, explosions, rockets, robots, detective games, or, for little tots, the garden. Kids from 3 to 10 can pick from one of many themes like Robot Summer Mania or Super Sleuth: Spy Masters. Weeklong day camps start at $279. More than 25 locations offer early drop-off at no cost and extended care for $50 per week. Check website for locations.