[Off-topic] Requests author discusses MentalHealthError exception
Marko Rauhamaa
marko at pacujo.net
Fri Mar 4 01:52:20 EST 2016
Gregory Ewing <greg.ewing at canterbury.ac.nz>:
> Mass on its own is not a conserved quantity. The thing that's
> conserved is total energy.
Similarly, momentum is conserved.
Whether mass is conserved or not depends on the chosen terminology.
> As far as I know, there are no negative masses anywhere in any of our
> current theories of physics, nor have we observed anything that would
> suggest the need for such a thing.
What is not known is how antimatter is affected by gravity: <URL:
http://news.berkeley.edu/2013/04/30/is-antimatter-anti-gravity/>.
Marko
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