https://hackerpaper.kaipfister.de/p/1106.0849/Collected HN comments and submissions linking this paper.enMon, 02 Nov 2026 11:16:22 GMThttps://news.ycombinator.com/item?id=11181505urn:hackerpapers:mention:1106.0849:11181505Fri, 26 Feb 2016 14:28:36 GMT<p>Let&#x27;s add &quot;at rest&quot; to the end of your question: &quot;I suppose each proton/neutron is unique in terms of its mass/energy content&quot; Oh boy, so there&#x27;s a can of worms. &quot;Unique&quot; would need to be nailed down to test that statement, and runs into some observational problems in that atoms exist and can be found in things like monatomic gasses in enormous enough quantities that you can wash out any contributions from other matter. These gas clouds can be measured and manipulated, and have been. The results limit the variation from proton to proton (and climbing the periodic table of elements, from…</p><p><a href="https://hackerpaper.kaipfister.de/p/1106.0849/">Paper and discussion history</a>. A mention is not an endorsement.</p>quant-ph