<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: jpmattia</title><link>https://news.ycombinator.com/user?id=jpmattia</link><description>Hacker News RSS</description><docs>https://hnrss.org/</docs><generator>hnrss v2.1.1</generator><lastBuildDate>Tue, 14 Apr 2026 20:45:09 +0000</lastBuildDate><atom:link href="https://hnrss.org/user?id=jpmattia" rel="self" type="application/rss+xml"></atom:link><item><title><![CDATA[New comment by jpmattia in "iNaturalist"]]></title><description><![CDATA[
<p>In fact, you had to pay extra to have your number/address omitted from the phone book.</p>
]]></description><pubDate>Fri, 03 Apr 2026 22:32:52 +0000</pubDate><link>https://news.ycombinator.com/item?id=47633211</link><dc:creator>jpmattia</dc:creator><comments>https://news.ycombinator.com/item?id=47633211</comments><guid isPermaLink="false">https://news.ycombinator.com/item?id=47633211</guid></item><item><title><![CDATA[New comment by jpmattia in "Microsoft is walking back Windows 11's AI overload"]]></title><description><![CDATA[
<p>Great. Let us hope that support for hardware without TPM is next. Creating several mountains worth of electronic waste was a terrible decision. And in the middle of the AI-induced memory shortage!<p>Although I have to admit: The combination of AI and required new hardware has been a nice boost for switching to Linux.</p>
]]></description><pubDate>Mon, 02 Feb 2026 15:18:07 +0000</pubDate><link>https://news.ycombinator.com/item?id=46856970</link><dc:creator>jpmattia</dc:creator><comments>https://news.ycombinator.com/item?id=46856970</comments><guid isPermaLink="false">https://news.ycombinator.com/item?id=46856970</guid></item><item><title><![CDATA[New comment by jpmattia in "Proof of Corn"]]></title><description><![CDATA[
<p>I think the most intriguing part of this effort: Farmers traditionally employ machines to achieve their harvest. Unless I'm mistaken, this is the first time that machines are employing humans to achieve their harvest.<p>I mean, more or less, but you see what I'm getting at.</p>
]]></description><pubDate>Fri, 23 Jan 2026 18:19:28 +0000</pubDate><link>https://news.ycombinator.com/item?id=46735790</link><dc:creator>jpmattia</dc:creator><comments>https://news.ycombinator.com/item?id=46735790</comments><guid isPermaLink="false">https://news.ycombinator.com/item?id=46735790</guid></item><item><title><![CDATA[New comment by jpmattia in "The microstructure of wealth transfer in prediction markets"]]></title><description><![CDATA[
<p>[I'm still thinking about this a day later!]<p>I think an additional table/graph of how large-bet performance vs small-bet performance would be interesting in general, as well as broken out by market type.<p>It kinda answers of the question: Are large bets equal to smart money? or are they equal in "smartness" to small bets?</p>
]]></description><pubDate>Tue, 20 Jan 2026 16:18:49 +0000</pubDate><link>https://news.ycombinator.com/item?id=46693614</link><dc:creator>jpmattia</dc:creator><comments>https://news.ycombinator.com/item?id=46693614</comments><guid isPermaLink="false">https://news.ycombinator.com/item?id=46693614</guid></item><item><title><![CDATA[New comment by jpmattia in "The microstructure of wealth transfer in prediction markets"]]></title><description><![CDATA[
<p>> <i>but i did find that politics was actually one of the most efficient categories (only ~1% maker/taker gap)</i><p>I confess I'm surprised by that result in particular. I realize your results are for Kalshi, but ISTR some reports from the presidential elections on Polymarket.<p>But more generally: When you say there is "only a ~1% maker/taker gap", is that weighted by the size of the bets? or is it averaged over the number of bets placed?<p>In any case: Thanks for a very interesting paper!</p>
]]></description><pubDate>Mon, 19 Jan 2026 18:42:37 +0000</pubDate><link>https://news.ycombinator.com/item?id=46682807</link><dc:creator>jpmattia</dc:creator><comments>https://news.ycombinator.com/item?id=46682807</comments><guid isPermaLink="false">https://news.ycombinator.com/item?id=46682807</guid></item><item><title><![CDATA[New comment by jpmattia in "The microstructure of wealth transfer in prediction markets"]]></title><description><![CDATA[
<p>Something that appears to be missing: Certain events attract "advertising" types of bets. E.g. There is value in making a candidate appear to be a leader, so dedicating dollars to swinging the market is more of a form of advertising than an intelligent bet.<p>So it would be interesting to measure the inefficiencies of various bets vs the total market value in that bet.<p>e: Although full disclosure, I did not pick apart the entire paper. Maybe it's buried in there.</p>
]]></description><pubDate>Mon, 19 Jan 2026 18:28:31 +0000</pubDate><link>https://news.ycombinator.com/item?id=46682673</link><dc:creator>jpmattia</dc:creator><comments>https://news.ycombinator.com/item?id=46682673</comments><guid isPermaLink="false">https://news.ycombinator.com/item?id=46682673</guid></item><item><title><![CDATA[New comment by jpmattia in "Iran has now been offline for 96 hours"]]></title><description><![CDATA[
<p>I would guess that someone is beaming a whole lot of wideband power at the satellites themselves, to overload the input receivers.</p>
]]></description><pubDate>Mon, 12 Jan 2026 18:42:57 +0000</pubDate><link>https://news.ycombinator.com/item?id=46592480</link><dc:creator>jpmattia</dc:creator><comments>https://news.ycombinator.com/item?id=46592480</comments><guid isPermaLink="false">https://news.ycombinator.com/item?id=46592480</guid></item><item><title><![CDATA[New comment by jpmattia in "Microsoft has a problem: lack of demand for its AI products"]]></title><description><![CDATA[
<p>Maybe they could add a helpful paper clip to improve sales.<p>Edit: Or better still, convince all of their customers to throw away perfectly good hardware and upgrade to one with a single extra chip, creating a hazardous waste epidemic for landfills as a nice side effect. It's especially important to do this in the middle of a RAM and HDD shortage.<p>Really, I'll just never be half the great business strategist that these guys are. <sigh></p>
]]></description><pubDate>Mon, 08 Dec 2025 17:09:02 +0000</pubDate><link>https://news.ycombinator.com/item?id=46194809</link><dc:creator>jpmattia</dc:creator><comments>https://news.ycombinator.com/item?id=46194809</comments><guid isPermaLink="false">https://news.ycombinator.com/item?id=46194809</guid></item><item><title><![CDATA[New comment by jpmattia in "Boston's subway system replacing 1890s-era wooden catenary system"]]></title><description><![CDATA[
<p>Hold a chain at its ends, and let it hang down naturally.  What is that shape called? A catenary and its equation is y = a cosh(x/a).<p>Maybe you all knew that factoid already, but I learned the name of shape only recently.</p>
]]></description><pubDate>Wed, 03 Dec 2025 19:32:36 +0000</pubDate><link>https://news.ycombinator.com/item?id=46138886</link><dc:creator>jpmattia</dc:creator><comments>https://news.ycombinator.com/item?id=46138886</comments><guid isPermaLink="false">https://news.ycombinator.com/item?id=46138886</guid></item><item><title><![CDATA[New comment by jpmattia in "What happened to Transmeta, the last big dotcom IPO"]]></title><description><![CDATA[
<p>> <i>so IBM handled manufacturing of its first-generation CPUs.</i><p>I'm curious: Is there a consensus on which startup companies achieved success using IBM as a fab? or if not a consensus, I'd settle for anecdotes too.<p>My own company (which built 40G optical transponders) used them back in that era. While the tech was first rate, the pricing was something to behold.</p>
]]></description><pubDate>Wed, 12 Nov 2025 15:04:32 +0000</pubDate><link>https://news.ycombinator.com/item?id=45901114</link><dc:creator>jpmattia</dc:creator><comments>https://news.ycombinator.com/item?id=45901114</comments><guid isPermaLink="false">https://news.ycombinator.com/item?id=45901114</guid></item><item><title><![CDATA[New comment by jpmattia in "Ticker: Don't die of heart disease"]]></title><description><![CDATA[
<p>> <i>worry instead about stroke.</i><p>You say that as if stroke is orthogonal to heart disease. Much of what prevents one prevents the other.</p>
]]></description><pubDate>Sat, 08 Nov 2025 17:01:41 +0000</pubDate><link>https://news.ycombinator.com/item?id=45858148</link><dc:creator>jpmattia</dc:creator><comments>https://news.ycombinator.com/item?id=45858148</comments><guid isPermaLink="false">https://news.ycombinator.com/item?id=45858148</guid></item><item><title><![CDATA[New comment by jpmattia in "Why should I care what color the bikeshed is? (1999)"]]></title><description><![CDATA[
<p>> <i>Although I’ve never had a boss that needed to find an error.</i><p>I think that is key. A great mentor early in my career pointed out to me: "A" rated people need to work for "A" rated bosses. It's possible to have a "B" or "C" person work for an "A" boss, but when you put "A" people under "B" or (god forbid) "C" bosses, all kinds of problems ensue.<p>[I've personally experienced that situation only once, and swore never again.]</p>
]]></description><pubDate>Sat, 01 Nov 2025 15:16:00 +0000</pubDate><link>https://news.ycombinator.com/item?id=45782307</link><dc:creator>jpmattia</dc:creator><comments>https://news.ycombinator.com/item?id=45782307</comments><guid isPermaLink="false">https://news.ycombinator.com/item?id=45782307</guid></item><item><title><![CDATA[New comment by jpmattia in "No I don't want to turn on Windows Backup with One Drive"]]></title><description><![CDATA[
<p>How do you deal with the short lifespan until EOL?  I've been using Rocky (and CentOS before that) simply to avoid dealing with EOL so often.</p>
]]></description><pubDate>Sun, 12 Oct 2025 18:57:26 +0000</pubDate><link>https://news.ycombinator.com/item?id=45560768</link><dc:creator>jpmattia</dc:creator><comments>https://news.ycombinator.com/item?id=45560768</comments><guid isPermaLink="false">https://news.ycombinator.com/item?id=45560768</guid></item><item><title><![CDATA[New comment by jpmattia in "Everything that's wrong with Google Search in one image"]]></title><description><![CDATA[
<p>Like many of you, I serve as IT support for family. Some of those family are beginning to slip cognitively, so I'd like to say: Fk google for doing this. You are confusing my relatives who cannot tell the difference between your ad-spam and actual links, and it is not an exaggeration to say that you are now taking advantage of old people.<p>I'm trying to install adblockers (uBlock) and move them over to chatgpt when possible. If anyone has better ideas, I'm all ears.</p>
]]></description><pubDate>Thu, 25 Sep 2025 00:35:10 +0000</pubDate><link>https://news.ycombinator.com/item?id=45367789</link><dc:creator>jpmattia</dc:creator><comments>https://news.ycombinator.com/item?id=45367789</comments><guid isPermaLink="false">https://news.ycombinator.com/item?id=45367789</guid></item><item><title><![CDATA[New comment by jpmattia in "Lead pigment in turmeric is the culprit in a global poisoning mystery (2024)"]]></title><description><![CDATA[
<p>And just like that, there was a mad rush of mass-spectrometer-for-home-use startups.</p>
]]></description><pubDate>Fri, 11 Jul 2025 17:01:51 +0000</pubDate><link>https://news.ycombinator.com/item?id=44534525</link><dc:creator>jpmattia</dc:creator><comments>https://news.ycombinator.com/item?id=44534525</comments><guid isPermaLink="false">https://news.ycombinator.com/item?id=44534525</guid></item><item><title><![CDATA[New comment by jpmattia in "Nitrogen Triiodide (2016)"]]></title><description><![CDATA[
<p>MIT has a long tradition of hacks, and among the first documented hacks in the 1870s for marching practice:<p>> <i>in which students sprinkled iodide of nitrogen over the grounds of a military drill, causing explosions under classmates' boots.</i><p><a href="https://www.slate.com/articles/life/culturebox/2012/02/mit_pranks_from_giant_torpedoes_to_stolen_police_cars_.html" rel="nofollow">https://www.slate.com/articles/life/culturebox/2012/02/mit_p...</a></p>
]]></description><pubDate>Mon, 02 Jun 2025 03:44:49 +0000</pubDate><link>https://news.ycombinator.com/item?id=44155674</link><dc:creator>jpmattia</dc:creator><comments>https://news.ycombinator.com/item?id=44155674</comments><guid isPermaLink="false">https://news.ycombinator.com/item?id=44155674</guid></item><item><title><![CDATA[New comment by jpmattia in "ZEUS – A new two-petawatt laser facility at the University of Michigan"]]></title><description><![CDATA[
<p>Back in graduate school, I TA'd an electrostatics course. We were going through the details of the basic parallel-plate capacitor, and so Prof. Peter Hagelstein (of the project you listed above) used the example of how much energy was stored in a football-field sized set of parallel-plate capacitors with oil as a high-breakdown dielectric.<p>The students were dutifully copying the lecture while I was sitting there with my mouth agape realizing that he was working through a simplified example of what energy storage was required for the X-ray laser.  IIRC Those guys had their own substation, and would charge the capacitors. The switch would get thrown and the sublasers would shoot at the molybdenum target, which would laze in the X-ray spectrum (and the molybdenum would vaporize, I think.)<p>Afterwards, I asked him how on earth the energy was transferred from the caps to the sublasers: He just smiled and said "very carefully".</p>
]]></description><pubDate>Thu, 22 May 2025 03:03:51 +0000</pubDate><link>https://news.ycombinator.com/item?id=44058374</link><dc:creator>jpmattia</dc:creator><comments>https://news.ycombinator.com/item?id=44058374</comments><guid isPermaLink="false">https://news.ycombinator.com/item?id=44058374</guid></item><item><title><![CDATA[New comment by jpmattia in "Dilbert creator Scott Adams says he will die soon from same cancer as Joe Biden"]]></title><description><![CDATA[
<p>> <i>part of the depicted did come from anecdotes</i><p>He spoke at MIT (early 90s?) and I remember him talking about making fun of PacBell colleagues in his comic: They would recognize themselves, ask him to autograph the comic for them, and then go away happy (thus making fun of them a second time.)</p>
]]></description><pubDate>Mon, 19 May 2025 18:25:43 +0000</pubDate><link>https://news.ycombinator.com/item?id=44033039</link><dc:creator>jpmattia</dc:creator><comments>https://news.ycombinator.com/item?id=44033039</comments><guid isPermaLink="false">https://news.ycombinator.com/item?id=44033039</guid></item><item><title><![CDATA[New comment by jpmattia in "Dead Stars Don’t Radiate"]]></title><description><![CDATA[
<p>I wrote in the other reply:<p>> <i>As for others, the set of people who understand that Hawking radiation exists has nearly 100% overlap with those who know that black bodies and spinning magnets radiate, so for those folks who are in the set who are also unfamiliar with the author, perhaps it's more clickbaity.</i><p>So according to my theory, you must in the set that understands Hawking radiation + black bodies + E&M, but not in the set familiar with Baez.<p>I worked hard on my theory, please don't let me down and be a counterexample. :)</p>
]]></description><pubDate>Sun, 18 May 2025 19:36:47 +0000</pubDate><link>https://news.ycombinator.com/item?id=44023802</link><dc:creator>jpmattia</dc:creator><comments>https://news.ycombinator.com/item?id=44023802</comments><guid isPermaLink="false">https://news.ycombinator.com/item?id=44023802</guid></item><item><title><![CDATA[New comment by jpmattia in "Dead Stars Don’t Radiate"]]></title><description><![CDATA[
<p>Well, you got me thinking about "What <i>exactly</i> is clickbait?"<p>So full disclosure: I've directly interacted with John Carlos Baez only in social media, with the topics as disparate as music and observational astronomy. My own QFT & GR background is grad course level but with little actual usage in my career. (I've done more solid-state + high-speed electronics work, with a bunch of programming as well.) With that background, and turning the pedantry dial up to 11:<p>To me, one distinguishing element of clickbait is that the post is ultimately disappointing. The usual M.O. for clickbait is that the website needs eyeballs for advertising, so they beef up a headline of an uninteresting article with the expectation of getting extra monetization compared to an honest headline.<p>I would venture a guess that he doesn't actually care about monetization, or really even extra clicks, with this post. The screenshot with the big red X through the popsci article sets the expectation pretty quickly, and the tone of the rest of the post is really a rant that mediocre science made it into PRL and then into the popular science literature. He explicitly calls out the popsci journalists for laziness, but in a clever (I'm pretty sure Mark Twain would approve of his name being taken in vain) and erudite (correct use of the subjunctive) way.<p>Would I have clicked on the title without seeing the authorship johncarlosbaez.wordpress.com? Maybe but I doubt it. There is so much bad popsci physics out there that I'm pretty trained to ignore obviously inadequate headlines. So on a scale of 1-10, I'd rate the click-baityness of the headline no more than a 3. He got me to click, but only because I knew it was his post.<p>As for others, the set of people who understand that Hawking radiation exists has nearly 100% overlap with those who know that black bodies and spinning magnets radiate, so for those folks who are in the set who are also unfamiliar with the author, perhaps it's more clickbaity.<p>[edit: And I can't believe you got me to write that many words on the clickbait philosophy. Have I been baited? :) ]</p>
]]></description><pubDate>Sun, 18 May 2025 18:38:09 +0000</pubDate><link>https://news.ycombinator.com/item?id=44023431</link><dc:creator>jpmattia</dc:creator><comments>https://news.ycombinator.com/item?id=44023431</comments><guid isPermaLink="false">https://news.ycombinator.com/item?id=44023431</guid></item></channel></rss>