<rss version="2.0" xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:atom="http://www.w3.org/2005/Atom"><channel><title>Hacker News: mpreda</title><link>https://news.ycombinator.com/user?id=mpreda</link><description>Hacker News RSS</description><docs>https://hnrss.org/</docs><generator>hnrss v2.1.1</generator><lastBuildDate>Sat, 18 Apr 2026 08:59:44 +0000</lastBuildDate><atom:link href="https://hnrss.org/user?id=mpreda" rel="self" type="application/rss+xml"></atom:link><item><title><![CDATA[New comment by mpreda in "Peptides: where to begin?"]]></title><description><![CDATA[
<p>Given that many people experiment on themselves anyway, I feel it's a pity and a loss for science that the outcomes of those self-experiments are not collected and aggregated.<p>The article itself raises the issue of "lack of clinical data", given that these substances are relativelly new. But the lack of data may originate from a certain stiffness, or lack of accessibility and high cost of clinical trials. An alternative source of information are these people who self-experiment, but unfortunatelly this information is mostly lost instead of being captured.<p>How could this proposal work in practice? clearly the data would be noisy, contain some false reporting, biased, subjective etc. But statistical processing of a large number of reports (coming from hudreds of thousands or millions of self-reporting subjects) may still extract relevant scientific information; that we're dropping on the floor right now.<p>An example: I'm experimenting with a radical diet. I keep observations for myself, but they're not shared with anybody and don't contribute to science.<p>What the altervative would be: I would enroll on a web page, where I would describe the experiment I plan to do before I start it. I would be get a code for a blood/urine work for the "before" state, with the agreement that the results, anonimized, are shared with the platform. Weekly I would report on the platform observations, such as: got sick in this particular way, wheight variations, sleep eval, or any other changes.<p>At the end, or periodically I would get new free blood/urine work with the results shared.<p>Research institutes and pharma would get access to the data, to aggregate and denoise as they can to extract the latent information.</p>
]]></description><pubDate>Wed, 08 Apr 2026 08:55:16 +0000</pubDate><link>https://news.ycombinator.com/item?id=47687290</link><dc:creator>mpreda</dc:creator><comments>https://news.ycombinator.com/item?id=47687290</comments><guid isPermaLink="false">https://news.ycombinator.com/item?id=47687290</guid></item><item><title><![CDATA[New comment by mpreda in "Man wearing metallic necklace dies after being sucked into MRI machine"]]></title><description><![CDATA[
<p>Not to mention that "gauss" sounds deadlier than "tesla" to begin with. Talking about choosing the right units.</p>
]]></description><pubDate>Mon, 21 Jul 2025 14:34:09 +0000</pubDate><link>https://news.ycombinator.com/item?id=44635582</link><dc:creator>mpreda</dc:creator><comments>https://news.ycombinator.com/item?id=44635582</comments><guid isPermaLink="false">https://news.ycombinator.com/item?id=44635582</guid></item><item><title><![CDATA[New comment by mpreda in "Photon transport through the entire adult human head"]]></title><description><![CDATA[
<p>In the nose as well.</p>
]]></description><pubDate>Tue, 17 Jun 2025 09:53:04 +0000</pubDate><link>https://news.ycombinator.com/item?id=44297348</link><dc:creator>mpreda</dc:creator><comments>https://news.ycombinator.com/item?id=44297348</comments><guid isPermaLink="false">https://news.ycombinator.com/item?id=44297348</guid></item><item><title><![CDATA[New comment by mpreda in "US Administration announces 34% tariffs on China, 20% on EU"]]></title><description><![CDATA[
<p>> They want to repudiate foreign held debt, or devalue it, by revaluation of the USD<p>I don't understand, who's holding that "foreign held debt"? foreign countries I suppose, so which countries do you have in mind?<p>For one, it's not China, which holds a large amount of US treasury bonds (so basically, China is a lender of USD). So the revaluation of USD would work great for China: one, the value of the China-held USD bonds increases, and second, the price of Chinese exports decreases in USD terms.<p>So help me understand, what's the plan with the revaluation of USD?</p>
]]></description><pubDate>Thu, 03 Apr 2025 09:14:47 +0000</pubDate><link>https://news.ycombinator.com/item?id=43566991</link><dc:creator>mpreda</dc:creator><comments>https://news.ycombinator.com/item?id=43566991</comments><guid isPermaLink="false">https://news.ycombinator.com/item?id=43566991</guid></item><item><title><![CDATA[New comment by mpreda in "US Administration announces 34% tariffs on China, 20% on EU"]]></title><description><![CDATA[
<p>> arabic numerals<p>Soon to be "Numerals of America"</p>
]]></description><pubDate>Thu, 03 Apr 2025 08:35:54 +0000</pubDate><link>https://news.ycombinator.com/item?id=43566660</link><dc:creator>mpreda</dc:creator><comments>https://news.ycombinator.com/item?id=43566660</comments><guid isPermaLink="false">https://news.ycombinator.com/item?id=43566660</guid></item><item><title><![CDATA[New comment by mpreda in "It doesn't cost much to improve someone's life"]]></title><description><![CDATA[
<p>But the US is efficiently disentangling itself from the entire rest of the world as we speak; so that argument may not hold anymore in the near future.</p>
]]></description><pubDate>Sat, 15 Mar 2025 06:30:42 +0000</pubDate><link>https://news.ycombinator.com/item?id=43370471</link><dc:creator>mpreda</dc:creator><comments>https://news.ycombinator.com/item?id=43370471</comments><guid isPermaLink="false">https://news.ycombinator.com/item?id=43370471</guid></item><item><title><![CDATA[New comment by mpreda in "It doesn't cost much to improve someone's life"]]></title><description><![CDATA[
<p>Indeed, federations splitting apart -- that's what happens in tough times.</p>
]]></description><pubDate>Sat, 15 Mar 2025 06:24:12 +0000</pubDate><link>https://news.ycombinator.com/item?id=43370443</link><dc:creator>mpreda</dc:creator><comments>https://news.ycombinator.com/item?id=43370443</comments><guid isPermaLink="false">https://news.ycombinator.com/item?id=43370443</guid></item><item><title><![CDATA[New comment by mpreda in "STEPS Toward the Reinvention of Programming (2012) [pdf]"]]></title><description><![CDATA[
<p>It's clear that alphabetical order is open to manipulation. Down that path and everybody in the scientific career will be named A.A.</p>
]]></description><pubDate>Mon, 10 Mar 2025 20:24:25 +0000</pubDate><link>https://news.ycombinator.com/item?id=43325647</link><dc:creator>mpreda</dc:creator><comments>https://news.ycombinator.com/item?id=43325647</comments><guid isPermaLink="false">https://news.ycombinator.com/item?id=43325647</guid></item><item><title><![CDATA[New comment by mpreda in "Global sales of combustion engine cars have peaked"]]></title><description><![CDATA[
<p>> Economic growth and population growth will likely keep that going up.<p>What population growth?</p>
]]></description><pubDate>Tue, 04 Mar 2025 09:09:59 +0000</pubDate><link>https://news.ycombinator.com/item?id=43252244</link><dc:creator>mpreda</dc:creator><comments>https://news.ycombinator.com/item?id=43252244</comments><guid isPermaLink="false">https://news.ycombinator.com/item?id=43252244</guid></item><item><title><![CDATA[New comment by mpreda in "Zelensky leaves White House after angry meeting"]]></title><description><![CDATA[
<p>The democratic system of checks-and-balances of USA needs to act to contain the Trump individual. After all the current USA government system is not a dictature and thus Trump is not supposed to have dictatorial powers.</p>
]]></description><pubDate>Sat, 01 Mar 2025 11:06:50 +0000</pubDate><link>https://news.ycombinator.com/item?id=43218129</link><dc:creator>mpreda</dc:creator><comments>https://news.ycombinator.com/item?id=43218129</comments><guid isPermaLink="false">https://news.ycombinator.com/item?id=43218129</guid></item><item><title><![CDATA[New comment by mpreda in "Zelensky leaves White House after angry meeting"]]></title><description><![CDATA[
<p>Impeach Trump.</p>
]]></description><pubDate>Sat, 01 Mar 2025 06:40:10 +0000</pubDate><link>https://news.ycombinator.com/item?id=43216594</link><dc:creator>mpreda</dc:creator><comments>https://news.ycombinator.com/item?id=43216594</comments><guid isPermaLink="false">https://news.ycombinator.com/item?id=43216594</guid></item><item><title><![CDATA[New comment by mpreda in "How do modern compilers choose which variables to put in registers?"]]></title><description><![CDATA[
<p>I second this.<p>It's nice to wish for the optimizer to do the [almost] perfect job, but sometimes that never arrives. Consider for example the case of AMD GPU ISA (GCN) generated by LLVM: it's been so far from optimal for so long, that one can lose hope that'll ever happen; and wish for a simple solution that works in the meantime.</p>
]]></description><pubDate>Mon, 17 Feb 2025 17:59:48 +0000</pubDate><link>https://news.ycombinator.com/item?id=43081617</link><dc:creator>mpreda</dc:creator><comments>https://news.ycombinator.com/item?id=43081617</comments><guid isPermaLink="false">https://news.ycombinator.com/item?id=43081617</guid></item><item><title><![CDATA[New comment by mpreda in "Nvidia's RTX 5090 power connectors are melting"]]></title><description><![CDATA[
<p>But I want fewer cables, not more.</p>
]]></description><pubDate>Tue, 11 Feb 2025 17:41:51 +0000</pubDate><link>https://news.ycombinator.com/item?id=43015680</link><dc:creator>mpreda</dc:creator><comments>https://news.ycombinator.com/item?id=43015680</comments><guid isPermaLink="false">https://news.ycombinator.com/item?id=43015680</guid></item><item><title><![CDATA[New comment by mpreda in "Nvidia's RTX 5090 power connectors are melting"]]></title><description><![CDATA[
<p>Now I must use lots of rather thick cables in my desktop (because I run GPUs).<p>Imagine that the GPU would instead suck up all the power it needs through the PCIe connector, without all those pesky cables. (right now PCIe can provied 75W at 12V, i.e. 6.25A; that same current would provide 300W at 48V).</p>
]]></description><pubDate>Tue, 11 Feb 2025 16:24:47 +0000</pubDate><link>https://news.ycombinator.com/item?id=43014722</link><dc:creator>mpreda</dc:creator><comments>https://news.ycombinator.com/item?id=43014722</comments><guid isPermaLink="false">https://news.ycombinator.com/item?id=43014722</guid></item><item><title><![CDATA[New comment by mpreda in "Nvidia's RTX 5090 power connectors are melting"]]></title><description><![CDATA[
<p>The voltage step-down is already in place, from 12V to whatever 1V or 0.8V is needed. Doing the same thing starting from 48V instead of 12V does not change anything fundamentally, I guess.</p>
]]></description><pubDate>Tue, 11 Feb 2025 16:11:10 +0000</pubDate><link>https://news.ycombinator.com/item?id=43014537</link><dc:creator>mpreda</dc:creator><comments>https://news.ycombinator.com/item?id=43014537</comments><guid isPermaLink="false">https://news.ycombinator.com/item?id=43014537</guid></item><item><title><![CDATA[New comment by mpreda in "Nvidia's RTX 5090 power connectors are melting"]]></title><description><![CDATA[
<p>Step the GPU voltage up to 48V. (anyway you make a new connector that's not compatible with existing PSUs. Why not actually fix a problem at the same time, once and for all! [48V should be enough for anybody, right?])</p>
]]></description><pubDate>Tue, 11 Feb 2025 16:06:35 +0000</pubDate><link>https://news.ycombinator.com/item?id=43014480</link><dc:creator>mpreda</dc:creator><comments>https://news.ycombinator.com/item?id=43014480</comments><guid isPermaLink="false">https://news.ycombinator.com/item?id=43014480</guid></item><item><title><![CDATA[New comment by mpreda in "Don't "optimize" conditional moves in shaders with mix()+step()"]]></title><description><![CDATA[
<p>Exactly. Consider this example:<p><pre><code>  a = f(z);
  b = g(z);
  v = x > y ? a : b;
</code></pre>
Assuming computing the two function calls f() and g() is relativelly expensive, it becomes a trade-off whether to emit conditional code or to compute both followed by a select. So it's not a simple choice, and the decision is made by the compiler.</p>
]]></description><pubDate>Sun, 09 Feb 2025 18:12:10 +0000</pubDate><link>https://news.ycombinator.com/item?id=42992321</link><dc:creator>mpreda</dc:creator><comments>https://news.ycombinator.com/item?id=42992321</comments><guid isPermaLink="false">https://news.ycombinator.com/item?id=42992321</guid></item><item><title><![CDATA[New comment by mpreda in "Don't make fun of renowned author Dan Brown (2013)"]]></title><description><![CDATA[
<p>This was no nice! had fun reading it.<p>Also learned the meaning of the conspicuous word <i>pulchritudinous</i>, which in the default Oxford languages dictionary Google uses [1] comes up with
"Dan gazed admiringly at the pulchritudinous brunette" as usage example.<p>[1] <a href="https://www.google.com/search?q=pulchritudinous" rel="nofollow">https://www.google.com/search?q=pulchritudinous</a></p>
]]></description><pubDate>Mon, 03 Feb 2025 07:13:28 +0000</pubDate><link>https://news.ycombinator.com/item?id=42915753</link><dc:creator>mpreda</dc:creator><comments>https://news.ycombinator.com/item?id=42915753</comments><guid isPermaLink="false">https://news.ycombinator.com/item?id=42915753</guid></item><item><title><![CDATA[New comment by mpreda in "Boosting Computational Fluid Dynamics Performance with AMD MI300X"]]></title><description><![CDATA[
<p>And the splitting into CDNA and RDNA comes from the same direction: market segmentation, to allow much higher prices for the CDNA data-center GPUs, while keeping the gamer-focused RDNA GPUs affordable for mere mortals. Of coures this backfires by making the powerful GPUs not available for mostly anybody anymore to experiment on.<p>For example this blog post, about how great MI300X is. Really, what do I care -- I'm not a billionaire.</p>
]]></description><pubDate>Sun, 19 Jan 2025 09:10:41 +0000</pubDate><link>https://news.ycombinator.com/item?id=42755336</link><dc:creator>mpreda</dc:creator><comments>https://news.ycombinator.com/item?id=42755336</comments><guid isPermaLink="false">https://news.ycombinator.com/item?id=42755336</guid></item><item><title><![CDATA[New comment by mpreda in "Boosting Computational Fluid Dynamics Performance with AMD MI300X"]]></title><description><![CDATA[
<p>It seems AMD has to choose between monetizing the GPUs <i>right now</i> by selling them at the maximum effective price, or forgoing that gain and selling the GPUs <i>at cost</i> and increasing GPU market share in the future. The choice between short-term gain and long-term gain.</p>
]]></description><pubDate>Sun, 19 Jan 2025 09:05:31 +0000</pubDate><link>https://news.ycombinator.com/item?id=42755308</link><dc:creator>mpreda</dc:creator><comments>https://news.ycombinator.com/item?id=42755308</comments><guid isPermaLink="false">https://news.ycombinator.com/item?id=42755308</guid></item></channel></rss>