<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>Fri, 30 Oct 2026 04:18:26 +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 "Emacs Turns 50"]]></title><description><![CDATA[
<p>I was very fortunate: Yale CS already used emacs in 1981, and offered local high school students the chance to take their classes.  By the time I got to MIT a year later, I didn't know that there were any other serious editors available!</p>
]]></description><pubDate>Wed, 28 Oct 2026 20:25:04 +0000</pubDate><link>https://news.ycombinator.com/item?id=50280381</link><dc:creator>jpmattia</dc:creator><comments>https://news.ycombinator.com/item?id=50280381</comments><guid isPermaLink="false">https://news.ycombinator.com/item?id=50280381</guid></item><item><title><![CDATA[New comment by jpmattia in "Pentagon grants DHS permission to test heat ray weapon for use at border"]]></title><description><![CDATA[
<p>And suddenly, there was a market for body-sized Bragg reflectors in the microwave region.</p>
]]></description><pubDate>Fri, 23 Oct 2026 16:41:12 +0000</pubDate><link>https://news.ycombinator.com/item?id=50211769</link><dc:creator>jpmattia</dc:creator><comments>https://news.ycombinator.com/item?id=50211769</comments><guid isPermaLink="false">https://news.ycombinator.com/item?id=50211769</guid></item><item><title><![CDATA[New comment by jpmattia in "'You Can See Everything' Review: Nathan Fielder's Doc About Elizabeth Holmes"]]></title><description><![CDATA[
<p>Holy moly, that was unsettling.</p>
]]></description><pubDate>Mon, 07 Sep 2026 15:38:28 +0000</pubDate><link>https://news.ycombinator.com/item?id=49599600</link><dc:creator>jpmattia</dc:creator><comments>https://news.ycombinator.com/item?id=49599600</comments><guid isPermaLink="false">https://news.ycombinator.com/item?id=49599600</guid></item><item><title><![CDATA[New comment by jpmattia in "Emacs 31 is around the corner: The changes I'm daily driving"]]></title><description><![CDATA[
<p>45 years for me. I don't even think about keystrokes anymore.</p>
]]></description><pubDate>Thu, 18 Jun 2026 19:38:29 +0000</pubDate><link>https://news.ycombinator.com/item?id=48590445</link><dc:creator>jpmattia</dc:creator><comments>https://news.ycombinator.com/item?id=48590445</comments><guid isPermaLink="false">https://news.ycombinator.com/item?id=48590445</guid></item><item><title><![CDATA[New comment by jpmattia in "Google to pay SpaceX $920M a month for compute capacity at xAI data centers"]]></title><description><![CDATA[
<p>> <i>and they get to join the index next year without a rule change.</i><p>You seem to have ignored the 50% float rule.  SpaceX is proposing to go public with about 5% of the float, but S&P requires 50%.<p>Do we think that the market will absorb the release of 45% of the shares?  I'm dubious.</p>
]]></description><pubDate>Sat, 06 Jun 2026 18:09:19 +0000</pubDate><link>https://news.ycombinator.com/item?id=48427415</link><dc:creator>jpmattia</dc:creator><comments>https://news.ycombinator.com/item?id=48427415</comments><guid isPermaLink="false">https://news.ycombinator.com/item?id=48427415</guid></item><item><title><![CDATA[New comment by jpmattia in "Tulip mania: when a single flower was worth more than a house (2025)"]]></title><description><![CDATA[
<p>Manias, Panics, and Crashes by Charles Kindleberger is a more modern book, which I'd recommend as well.</p>
]]></description><pubDate>Fri, 29 May 2026 13:22:46 +0000</pubDate><link>https://news.ycombinator.com/item?id=48322806</link><dc:creator>jpmattia</dc:creator><comments>https://news.ycombinator.com/item?id=48322806</comments><guid isPermaLink="false">https://news.ycombinator.com/item?id=48322806</guid></item><item><title><![CDATA[New comment by jpmattia in "The Century-Long Pause in Fundamental Physics"]]></title><description><![CDATA[
<p>> <i>Then I see he links to his own Revolutionary Theory, and it starts to look like outright crankary.</i><p>But what an AI-generated crankery!  Because I enjoy wasting my time, I chose a random point (beginning of ch2) and started reading:<p>> Standard field-theoretic practice selects equations using symmetry, gauge invariance, and conservation. This
chapter proposes a <i>cognate selection principle</i> built from three structural demands. A potential that carries
energy must appear on the right-hand side of its own equation, because the energy it carries is part of what
sources it. A potential that describes the same physics in every frame must have an equation that survives
change of observer. <i>A tensor equation must have matching ranks on both sides.</i><p>I've italicized a couple of items: <i>Cognate selection principle</i>? Really?<p><i>A tensor equation must have matching ranks on both sides</i>?  As opposed to all those tensor equations with differing ranks on both sides? Not exactly the type of thing that makes someone slap their head and shout "Why didn't <i>I</i> think of that?!"<p>The technobabble is interesting in that any single sentence might make sense in the absence of sentences nearby; It that regard, it's much like an Escher painting: Locally sensible, but globally out-to-lunch.</p>
]]></description><pubDate>Sat, 02 May 2026 14:22:48 +0000</pubDate><link>https://news.ycombinator.com/item?id=47986636</link><dc:creator>jpmattia</dc:creator><comments>https://news.ycombinator.com/item?id=47986636</comments><guid isPermaLink="false">https://news.ycombinator.com/item?id=47986636</guid></item><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></channel></rss>