That's because digital globes cost tens of thousands of dollars, versus an array of smart boards available for under $2,000, or digital textbooks, which can be free.
Digital globes, as the name suggests, are spherical but capable of displaying different global images, controlled by a PC or other video source. Operators -- museum personnel, corporate speakers, teachers -- can toggle between familiar static images such as terrain and newer views such as real-time weather patterns or animal habitats.
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The MathScience Innovation Center spent $39,500 for an 18-inch digital globe, called a Magic Planet, a carrying case and related software from Global Imagination. The MSIC serves 170,000 students in the Richmond, Va., area. "Funding was an issue," said Carroll Ellis, Earth and environmental science educator at the MSIC. "We had to look at grant funding."
Ellis felt the money was worth it to use an actual sphere for teaching astronomy, and for the Center's innovation mission. "When you go into a classroom you want something different and here at the Center that's what people expect from us," he said.
Ellis developed a curriculum built around an alien named Bob, who can change into any planet in the solar system, as well as other objects in outer space. Ellis goes out into the schools four days a week to teach the 90-minute lesson on the planets, primarily to area sixth graders. He says the globe, in its case, weighs about 50 pounds. He's now developing climate-related curriculum. The MSIC has anecdotal evidence that the digital globe improves learning, and is developing some ways to measure its impact.
There are no hard numbers available to measure the impact at the Rochester, Minn., public schools, either. There's been a 36-inch Magic Planet in the school district's planetarium since 2007, said Larry Mascotti, planetarium director for the Rochester Public Schools. The district spent nearly $50,000 to acquire its Magic Planet. He, too, cites anecdotal evidence based on observation of how students engage with the globe.
"One reason why we purchased it is it's a dynamic virtual teaching tool," Mascotti said. "It evolves with time. When new datasets are available we can use them. It's a very democratic teaching tool."
In Rochester, students come to the facility. Mascotti has a 90-minute session with third graders, teaching them how to tell the difference between stars and planets in the night sky, among other things. He also has developed lessons for eighth graders on plate tectonics on Mars and on Earth. He's working with teachers in the district to develop materials on geography, and is also exploring using the Magic Planet to teach math.