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There's an article in New Scientist, claiming that soundwaves travel upwards because they have negative mass, and have antigravity.
It's behind a paywall, but frankly sounds like a late April's Fools joke. ...
I believe this is - or is based upon - the following paper:
The mass of sound
Angelo Esposito, Rafael Krichevsky, and Alberto Nicolis
Department of Physics, Center for Theoretical Physics,
Columbia University, 538W 120th Street, New York, NY, 10027, USA
The pre-publication manuscript is hosted at arxiv.org at:
https://arxiv.org/pdf/1807.08771.pdf