I think negative mass is on sale through "Weight Watchers" (Plc) :-)
Ether that or it is a cousin of negative gravity, and we certainly had that (still have it till Jan 20) in the US & in the UK for another 4 years. Negative G pops-out from negative time and - boy don't we wish for that, like about 4 years (5 in the UK).
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awe