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A comment on Balloon detects first signs of a ‘sound tunnel’ in the sky.
Here's how they made it for ~$30 - https://journals.ametsoc.org/view/journals/atot/37/6/JTECH-D...
Fun version on Amazon for ~$30 - https://www.amazon.com/TEDCO-Tedcotoys-Activity-50-foot-Ball...
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Here's how they made it for ~$30 - https://journals.ametsoc.org/view/journals/atot/37/6/JTECH-D...
Fun version on Amazon for ~$30 - https://www.amazon.com/TEDCO-Tedcotoys-Activity-50-foot-Ball...