At the Potomac School in McLean, Va., this past school year, 13 seventh- and eighth-graders signed up for a biweekly science elective that proposed this challenge, reports the Washington Post: Take a photo of the curvature of the Earth and spend just $200 to do it. Science teacher Bill Wiley knew the kids could research online what tools they would need, including a weather balloon and a styrofoam cooler. But that was the easy part. They still had to figure out how to put it together. "I figured there was about a 60 percent chance they would pull it off,"...
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