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A comment on 'Dark fluid' with negative mass could dominate the universe. Parent comment

Re:'Dark fluid' with negative mass could dominate the universe by zamalek on Wednesday December 05, 2018 @12:29PM (#18610390)
We have an intuitive ~~example~~ approximation of this in real-life: balloons in a car[1].

[1]: https://www.youtube.com/watch?v=uAJlg8MDAlU

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Re:'Dark fluid' with negative mass could dominate the universe by taeric on Friday December 07, 2018 @12:32PM (#18629599)
I'm intrigued. Isn't the reason a balloon moves forward more of buoyancy? If you do the same experiment with the window open, doesn't it do as expected by most people?
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