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On eclipse day, hundreds of students will send up balloons for science

04:57
Student volunteers prepare a balloon for a morning launch in Cumberland, Md. On April 8, eclipse day, hundreds of balloons will be launched into the path of the eclipse to study the atmosphere. (Meredith Rizzo for NPR)
Student volunteers prepare a balloon for a morning launch in Cumberland, Md. On April 8, eclipse day, hundreds of balloons will be launched into the path of the eclipse to study the atmosphere. (Meredith Rizzo for NPR)

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