Physicists create 'negative mass'(phys.org)
phys.org
Physicists create 'negative mass'
https://www.phys.org/news/2017-04-physicists-negative-mass.html
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Discussion: https://news.ycombinator.com/item?id=14093860
https://www.phys.org/news/2017-04-physicists-negative-mass.html