The NASA Jet Propulsion Laboratory has devised a remarkable new type of sensor that could revolutionize the way scientists gather data. A Sensor Web is a network of many individual sensors that are about the size of a ping-pong ball. By themselves, they collect a single measurement-like temperature or humidity. But an entire Sensor Web can be spread out over a very large area and collect vast amounts of data remotely. The Sensor Webs Web site has a lot of information about the technology and its applications. A fun activity for kids is also given that teaches the basic techniques that Sensor Webs use to collect data.