https://scitechdaily.com/solar-powered-balloons-detect-mysterious-sounds-of-unknown-origins-in-earths-stratosphere/
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5/12/23 at 11:26am
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Inexpensive and easy to build, these data-collecting balloons capture low-frequency sound in the Earth’s atmosphere. Imagine if sending your science experiment 70,000 ft in the air just took painter’s plastic, tape, a dash of charcoal dust, and plenty of sunl…
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