<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: jdhwosnhw</title><link>https://news.ycombinator.com/user?id=jdhwosnhw</link><description>Hacker News RSS</description><docs>https://hnrss.org/</docs><generator>hnrss v2.1.1</generator><lastBuildDate>Mon, 13 Apr 2026 16:12:46 +0000</lastBuildDate><atom:link href="https://hnrss.org/user?id=jdhwosnhw" rel="self" type="application/rss+xml"></atom:link><item><title><![CDATA[New comment by jdhwosnhw in "Data centers in space makes no sense"]]></title><description><![CDATA[
<p>> A Starlink satellite uses about 5K Watts of solar power. It needs to dissipate around that amount (+ the sun power on it) just to operate.<p>The “+ solar power” part is the majority of the energy. Solar panel efficiency is only about 25-30% at beginning-of-life whereas typical albedos are effectively 100%. So your estimate is off by at least a factor of three.<p>Also, I’m not sure where you got 5 kw from. The area of the satellite is ~100 m2, which means they are intercepting over 100 kw of bolometric solar power.</p>
]]></description><pubDate>Wed, 04 Feb 2026 16:00:25 +0000</pubDate><link>https://news.ycombinator.com/item?id=46887444</link><dc:creator>jdhwosnhw</dc:creator><comments>https://news.ycombinator.com/item?id=46887444</comments><guid isPermaLink="false">https://news.ycombinator.com/item?id=46887444</guid></item><item><title><![CDATA[New comment by jdhwosnhw in "Economics of Orbital vs. Terrestrial Data Centers"]]></title><description><![CDATA[
<p>This still relies on a heat differential, as described in the Details section of your linked article: <a href="https://en.wikipedia.org/wiki/Thermophotovoltaic_energy_conversion#Details" rel="nofollow">https://en.wikipedia.org/wiki/Thermophotovoltaic_energy_conv...</a></p>
]]></description><pubDate>Thu, 18 Dec 2025 03:26:41 +0000</pubDate><link>https://news.ycombinator.com/item?id=46308610</link><dc:creator>jdhwosnhw</dc:creator><comments>https://news.ycombinator.com/item?id=46308610</comments><guid isPermaLink="false">https://news.ycombinator.com/item?id=46308610</guid></item><item><title><![CDATA[New comment by jdhwosnhw in "Economics of Orbital vs. Terrestrial Data Centers"]]></title><description><![CDATA[
<p>Useful, extractable energy comes from a temperature differential, not just temperature itself. Once your system is at temperature equilibrium, you cant extract energy anymore and must shed that temperature as heat</p>
]]></description><pubDate>Tue, 16 Dec 2025 19:09:15 +0000</pubDate><link>https://news.ycombinator.com/item?id=46292892</link><dc:creator>jdhwosnhw</dc:creator><comments>https://news.ycombinator.com/item?id=46292892</comments><guid isPermaLink="false">https://news.ycombinator.com/item?id=46292892</guid></item><item><title><![CDATA[New comment by jdhwosnhw in "Economics of Orbital vs. Terrestrial Data Centers"]]></title><description><![CDATA[
<p>This argument assumes that you only need to radiate away the energy that the solar actively turns into electricity, but you also need to dissipate all the excess heat that wasn’t converted. The solar bolometric flux at the earth is 1300 w/m2, or 2600 for 2 sq m. That works out to an efficiency of ~20% for your home solar, and your assumed value of 750 w yields an efficiency of ~30%, which is reasonable for space-rated solar. But assuming an overall albedo of ~5% that means that you were only accounting for a third of the total energy that needs to be radiated.<p>Put another way, 2 sq m intercepts 2600 w of solar power but only radiates ~1700 w at 350 k, which means it needs to be run at a higher temperature of nearly 125 celsius to achieve equilibrium.</p>
]]></description><pubDate>Tue, 16 Dec 2025 17:20:50 +0000</pubDate><link>https://news.ycombinator.com/item?id=46291262</link><dc:creator>jdhwosnhw</dc:creator><comments>https://news.ycombinator.com/item?id=46291262</comments><guid isPermaLink="false">https://news.ycombinator.com/item?id=46291262</guid></item><item><title><![CDATA[New comment by jdhwosnhw in "A linear-time alternative for Dimensionality Reduction and fast visualisation"]]></title><description><![CDATA[
<p>Thats not how big-O notation works. You don’t know what proportionality constants are being hidden by the notation so you cant make any assertions about absolute runtimes</p>
]]></description><pubDate>Tue, 16 Dec 2025 16:01:34 +0000</pubDate><link>https://news.ycombinator.com/item?id=46290200</link><dc:creator>jdhwosnhw</dc:creator><comments>https://news.ycombinator.com/item?id=46290200</comments><guid isPermaLink="false">https://news.ycombinator.com/item?id=46290200</guid></item><item><title><![CDATA[New comment by jdhwosnhw in "High-income job losses are cooling housing demand"]]></title><description><![CDATA[
<p>In most places in the US (california being a notable exception) taxes are reassessed regularly based on market conditions. In some areas this can result in the property taxes rising to an appreciable fraction of the mortgage rate - or in the GPs case, what the mortgage would have been, if they hadnt paid it off already.</p>
]]></description><pubDate>Tue, 02 Dec 2025 14:41:49 +0000</pubDate><link>https://news.ycombinator.com/item?id=46121663</link><dc:creator>jdhwosnhw</dc:creator><comments>https://news.ycombinator.com/item?id=46121663</comments><guid isPermaLink="false">https://news.ycombinator.com/item?id=46121663</guid></item><item><title><![CDATA[New comment by jdhwosnhw in "High-income job losses are cooling housing demand"]]></title><description><![CDATA[
<p>> Happiness simply comes from other things in life than 'my castle my kingdom'.
I know its a typical US mindset (and far from US only) to have a house on your own, but its still an emotion<p>This is a frustratingly uninformed take. You are comparing apples to oranges by equating your decision-making process with that of someone in the US. The drive to own a house in the US is not just mediated by “emotion” - the calculus is fundamentally different than in many nordic countries. For instance, very few places in the US have rent control, which means that renting represents substantial risk of either experiencing a large increase in cost, or being forced to move at irregular intervals. On the other end of the spectrum, the US is one of the only places that offers 30 year mortgages, which means that (taxes and repairs aside) buying a home on credit still offers a high level of predictable cost over the long term. 
Also, at least historically, there are very many places in the US for which housing is very affordable, given that the USs overall population density is so much lower than the average European country.<p>This is of course not to suggest that buying is always a good call - but it is often a logical and financially sound one.<p><a href="https://bopoolen.nu/en/laws-regulations/" rel="nofollow">https://bopoolen.nu/en/laws-regulations/</a></p>
]]></description><pubDate>Tue, 02 Dec 2025 14:37:24 +0000</pubDate><link>https://news.ycombinator.com/item?id=46121608</link><dc:creator>jdhwosnhw</dc:creator><comments>https://news.ycombinator.com/item?id=46121608</comments><guid isPermaLink="false">https://news.ycombinator.com/item?id=46121608</guid></item><item><title><![CDATA[New comment by jdhwosnhw in "Someone at YouTube Needs Glasses: The Prophecy Has Been Fulfilled"]]></title><description><![CDATA[
<p>Thats like saying the grocery store is ok with me eating some of the grapes while I shop so they must be ok with me walking out without paying for my groceries.<p>I’m not trying to be obtuse here. I really want to understand some sort of reasonable moral justification for actively avoiding paying for a service that you are using / circumventing the mechanism by which the business makes money.</p>
]]></description><pubDate>Wed, 26 Nov 2025 22:47:02 +0000</pubDate><link>https://news.ycombinator.com/item?id=46063191</link><dc:creator>jdhwosnhw</dc:creator><comments>https://news.ycombinator.com/item?id=46063191</comments><guid isPermaLink="false">https://news.ycombinator.com/item?id=46063191</guid></item><item><title><![CDATA[New comment by jdhwosnhw in "Someone at YouTube Needs Glasses: The Prophecy Has Been Fulfilled"]]></title><description><![CDATA[
<p>Except in this case the only way the store makes money is either by you paying an entrance fee or by you looking at the products. You are being delivered a service (whose delivery costs money) while actively circumventing the mechanism the store employs to be compensated for that service.</p>
]]></description><pubDate>Wed, 26 Nov 2025 17:37:58 +0000</pubDate><link>https://news.ycombinator.com/item?id=46060092</link><dc:creator>jdhwosnhw</dc:creator><comments>https://news.ycombinator.com/item?id=46060092</comments><guid isPermaLink="false">https://news.ycombinator.com/item?id=46060092</guid></item><item><title><![CDATA[New comment by jdhwosnhw in "Someone at YouTube Needs Glasses: The Prophecy Has Been Fulfilled"]]></title><description><![CDATA[
<p>You are using a service without paying for the service by actively circumventing the payment mechanism. Is that not stealing?</p>
]]></description><pubDate>Wed, 26 Nov 2025 17:35:05 +0000</pubDate><link>https://news.ycombinator.com/item?id=46060069</link><dc:creator>jdhwosnhw</dc:creator><comments>https://news.ycombinator.com/item?id=46060069</comments><guid isPermaLink="false">https://news.ycombinator.com/item?id=46060069</guid></item><item><title><![CDATA[New comment by jdhwosnhw in "Someone at YouTube Needs Glasses: The Prophecy Has Been Fulfilled"]]></title><description><![CDATA[
<p>I would genuinely like to understand this perspective. Ads or paying for premium is how the underlying business makes money. The UX might suck but you have a choice - you can just not watch YouTube. The approach you describe (which i understand is a popular one) is equivalent to justifying robbing a store because their prices are too high.</p>
]]></description><pubDate>Wed, 26 Nov 2025 15:15:32 +0000</pubDate><link>https://news.ycombinator.com/item?id=46058159</link><dc:creator>jdhwosnhw</dc:creator><comments>https://news.ycombinator.com/item?id=46058159</comments><guid isPermaLink="false">https://news.ycombinator.com/item?id=46058159</guid></item><item><title><![CDATA[New comment by jdhwosnhw in "Language models are injective and hence invertible"]]></title><description><![CDATA[
<p>A slightly stronger (and more relevant) statement is that the number of mutually nearly orthogonal vectors you can simultaneously pack into an N dimensional space is exponential in N. Here “mutually nearly orthogonal” can be formally defined as: choose some threshold epsilon>0 - the set S of unit vectors is nearly mutually orthogonal if the maximum of the pairwise dot products of between all members if S is less than epsilon. The statement of the exponential growth of the size of this set with N is (amazingly) independent of the value of epsilon (although the rate of growth does obviously depend on that value).<p>This is pretty unintuitive for us 3D beings.</p>
]]></description><pubDate>Thu, 30 Oct 2025 19:00:42 +0000</pubDate><link>https://news.ycombinator.com/item?id=45763904</link><dc:creator>jdhwosnhw</dc:creator><comments>https://news.ycombinator.com/item?id=45763904</comments><guid isPermaLink="false">https://news.ycombinator.com/item?id=45763904</guid></item><item><title><![CDATA[New comment by jdhwosnhw in "A short statistical reasoning test"]]></title><description><![CDATA[
<p>That would also be an incorrect phrasing. This entire thread is a good illustration of the difficulty of speaking precisely about probabilistic concepts.<p>(The number of successes has zero uncertainty. If you flip a coin 10 times and get 5 heads, there is no uncertainty on the number of heads. In general, for any statistical model the uncertainty is only with respect to an underlying model parameter - in this example, while your  number of successes is perfectly known, it can be used to infer a <i>probability</i> of success, p, of 0.5, and there is uncertainty associated with that inferred probability.)</p>
]]></description><pubDate>Mon, 18 Aug 2025 11:56:08 +0000</pubDate><link>https://news.ycombinator.com/item?id=44939644</link><dc:creator>jdhwosnhw</dc:creator><comments>https://news.ycombinator.com/item?id=44939644</comments><guid isPermaLink="false">https://news.ycombinator.com/item?id=44939644</guid></item><item><title><![CDATA[New comment by jdhwosnhw in "GDPR meant nothing: chat control ends privacy for the EU [video]"]]></title><description><![CDATA[
<p>> How much of a chance do you think we have of meaningfully changing a government, if they can guess with 80% degree accuracy how everyone voted, based on their chats and social networks<p>This doesnt really detract from your overall point, but you may be underestimating how easy it already is for the government to tell how you will vote, without use of networking information. Just knowing someone’s educational level and zip code is enough to guess their voting preferences to a high degree of accuracy (the latter component being the reason why gerrymandering is so effective).</p>
]]></description><pubDate>Sun, 17 Aug 2025 15:05:15 +0000</pubDate><link>https://news.ycombinator.com/item?id=44932131</link><dc:creator>jdhwosnhw</dc:creator><comments>https://news.ycombinator.com/item?id=44932131</comments><guid isPermaLink="false">https://news.ycombinator.com/item?id=44932131</guid></item><item><title><![CDATA[New comment by jdhwosnhw in "Non-invasive vagus nerve stimulation and exercise capacity in healthy volunteers"]]></title><description><![CDATA[
<p>Unfortunately I’m in the same boat. What appears especially telling is:<p>> tVNS applied for 30 min daily over 7 consecutive days increased VO2peak by 1.04 mL/kg/min (*95% CI: .34–1.73*; P = .005), compared with no change after sham stimulation (−0.54 mL/kg/min; *95% CI: −1.52 to .45*)<p>(emphasis mine) The 95% CIs for the case and control groups overlap. Seems borderline irresponsible to have a  the abstract reporting a significant result.</p>
]]></description><pubDate>Sun, 17 Aug 2025 00:27:24 +0000</pubDate><link>https://news.ycombinator.com/item?id=44927961</link><dc:creator>jdhwosnhw</dc:creator><comments>https://news.ycombinator.com/item?id=44927961</comments><guid isPermaLink="false">https://news.ycombinator.com/item?id=44927961</guid></item><item><title><![CDATA[New comment by jdhwosnhw in "Simulating and Visualising the Central Limit Theorem"]]></title><description><![CDATA[
<p>I’m not sure what you mean by “higher population” but fyi what determines the required number of samples is a function of the full shape of the underlying distribution. For instance the Berry Esseen inequality puts bounds on the convergence rate as a function of the first two central moments of the underlying distribution. But the point is that the convergence rate to Gaussian can be arbitrarily slow!<p><a href="https://en.m.wikipedia.org/wiki/Berry%E2%80%93Esseen_theorem" rel="nofollow">https://en.m.wikipedia.org/wiki/Berry%E2%80%93Esseen_theorem</a></p>
]]></description><pubDate>Fri, 15 Aug 2025 13:01:40 +0000</pubDate><link>https://news.ycombinator.com/item?id=44911875</link><dc:creator>jdhwosnhw</dc:creator><comments>https://news.ycombinator.com/item?id=44911875</comments><guid isPermaLink="false">https://news.ycombinator.com/item?id=44911875</guid></item><item><title><![CDATA[New comment by jdhwosnhw in "Wholesale prices rose 0.9% in July, more than expected"]]></title><description><![CDATA[
<p>I’ve heard this statistic before and it always strikes me as basically a non-sequitor. You’re writing down two percentages as if they are meaningful with respect to one another, but they arent.<p>If we as a society agree that some sort of progressive tax system is good (based on the fact that the mere act of survival comes with fixed costs, that naturally impact low-wealth holders over high-wealth holders) then we presumably expect higher wealth people to shoulder a larger burden of the cost of maintaining society, relative to that wealth.<p>The top 1% hold >30% of all wealth in the US, which, by the logic I described above, makes your 40% figure sound not just not exorbitant, but possibly too low.<p><a href="https://www.federalreserve.gov/releases/z1/dataviz/dfa/distribute/table/#quarter:142;series:Net%20worth;demographic:networth;population:all;units:shares" rel="nofollow">https://www.federalreserve.gov/releases/z1/dataviz/dfa/distr...</a></p>
]]></description><pubDate>Thu, 14 Aug 2025 20:12:28 +0000</pubDate><link>https://news.ycombinator.com/item?id=44905102</link><dc:creator>jdhwosnhw</dc:creator><comments>https://news.ycombinator.com/item?id=44905102</comments><guid isPermaLink="false">https://news.ycombinator.com/item?id=44905102</guid></item><item><title><![CDATA[New comment by jdhwosnhw in "GPT-5"]]></title><description><![CDATA[
<p>I would still say its completely wrong, given that this explanation makes explicit predictions that are falsifiable, eg, that airplanes could not fly upside down (they can!).</p>
]]></description><pubDate>Thu, 07 Aug 2025 20:41:10 +0000</pubDate><link>https://news.ycombinator.com/item?id=44830066</link><dc:creator>jdhwosnhw</dc:creator><comments>https://news.ycombinator.com/item?id=44830066</comments><guid isPermaLink="false">https://news.ycombinator.com/item?id=44830066</guid></item><item><title><![CDATA[New comment by jdhwosnhw in "Python performance myths and fairy tales"]]></title><description><![CDATA[
<p>> Yep, for me it confirms all the reasons why I think python is slow<p>Yes, that is literally the explicit point of the talk. The first myth of the article was “python is not slow“</p>
]]></description><pubDate>Wed, 06 Aug 2025 14:21:27 +0000</pubDate><link>https://news.ycombinator.com/item?id=44812407</link><dc:creator>jdhwosnhw</dc:creator><comments>https://news.ycombinator.com/item?id=44812407</comments><guid isPermaLink="false">https://news.ycombinator.com/item?id=44812407</guid></item><item><title><![CDATA[New comment by jdhwosnhw in "Ask HN: What trick of the trade took you too long to learn?"]]></title><description><![CDATA[
<p>Very reasonable, I fully agree on that front</p>
]]></description><pubDate>Tue, 05 Aug 2025 15:30:17 +0000</pubDate><link>https://news.ycombinator.com/item?id=44799303</link><dc:creator>jdhwosnhw</dc:creator><comments>https://news.ycombinator.com/item?id=44799303</comments><guid isPermaLink="false">https://news.ycombinator.com/item?id=44799303</guid></item></channel></rss>