Path: csiph.com!eternal-september.org!feeder.eternal-september.org!mx02.eternal-september.org!.POSTED!not-for-mail From: Marko Rauhamaa Newsgroups: comp.lang.python Subject: Re: [Off-topic] Requests author discusses MentalHealthError exception Date: Fri, 04 Mar 2016 08:52:20 +0200 Organization: A noiseless patient Spider Lines: 18 Message-ID: <87si063fbv.fsf@elektro.pacujo.net> References: <56d16e6a$0$1593$c3e8da3$5496439d@news.astraweb.com> <56d5cbef$0$22142$c3e8da3$5496439d@news.astraweb.com> <56d7a130$0$1611$c3e8da3$5496439d@news.astraweb.com> <101Cy.1411363$QP2.758114@fx42.am4> Mime-Version: 1.0 Content-Type: text/plain Injection-Info: mx02.eternal-september.org; posting-host="b7cb1518d23ec19d482dcc9c31d30fdd"; logging-data="3134"; mail-complaints-to="abuse@eternal-september.org"; posting-account="U2FsdGVkX1+tW2xOQEW9aF+VslEGk2oG" User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/24.5 (gnu/linux) Cancel-Lock: sha1:HXMzAc++kTSmfyPIvMcoPhwCVGo= sha1:zat64R2SoKSrGrxO46haWhSZ9rU= Xref: csiph.com comp.lang.python:104017 Gregory Ewing : > 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: . Marko