<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: wcoenen</title><link>https://news.ycombinator.com/user?id=wcoenen</link><description>Hacker News RSS</description><docs>https://hnrss.org/</docs><generator>hnrss v2.1.1</generator><lastBuildDate>Sat, 18 Apr 2026 11:16:57 +0000</lastBuildDate><atom:link href="https://hnrss.org/user?id=wcoenen" rel="self" type="application/rss+xml"></atom:link><item><title><![CDATA[New comment by wcoenen in ""Disregard That" Attacks"]]></title><description><![CDATA[
<p>You don't even need to double the tokens. Tokens are mapped to vectors right at the input of the LLM, so one of the numbers in that vector could be reserved to represent something like "authority". This way information about the source of each individual token can be injected right at the input.<p>System prompt tokens would get the maximum authority value, and random downloaded data would get the minimum authority value. Tokens from the user prompt could be somewhere in between.<p>Then train the model with examples that show that system prompts should be respected, and prompt injection attacks should be ignored.</p>
]]></description><pubDate>Thu, 26 Mar 2026 19:50:11 +0000</pubDate><link>https://news.ycombinator.com/item?id=47534867</link><dc:creator>wcoenen</dc:creator><comments>https://news.ycombinator.com/item?id=47534867</comments><guid isPermaLink="false">https://news.ycombinator.com/item?id=47534867</guid></item><item><title><![CDATA[New comment by wcoenen in "Europe sleepwalked into yet another energy crisis"]]></title><description><![CDATA[
<p>The coal price has a tendency to spike during an energy crisis. The market is more volatile than crude oil. For example, check what happened in 2022.<p><a href="https://tradingeconomics.com/commodity/coal" rel="nofollow">https://tradingeconomics.com/commodity/coal</a></p>
]]></description><pubDate>Fri, 20 Mar 2026 07:18:52 +0000</pubDate><link>https://news.ycombinator.com/item?id=47451502</link><dc:creator>wcoenen</dc:creator><comments>https://news.ycombinator.com/item?id=47451502</comments><guid isPermaLink="false">https://news.ycombinator.com/item?id=47451502</guid></item><item><title><![CDATA[New comment by wcoenen in "SpaceX IPO Scandal"]]></title><description><![CDATA[
<p>It seems the S&P 500 indices only take the free-float shares into account when calculating weights:<p><i>S&P DJI’s market cap-weighted indices are float-adjusted – the number of shares outstanding is reduced
to exclude closely held shares from the index calculation because such shares are not available to
investors.</i><p>page 6 of <a href="https://www.spglobal.com/spdji/en/documents/methodologies/methodology-index-math.pdf" rel="nofollow">https://www.spglobal.com/spdji/en/documents/methodologies/me...</a></p>
]]></description><pubDate>Sun, 15 Mar 2026 22:41:04 +0000</pubDate><link>https://news.ycombinator.com/item?id=47392775</link><dc:creator>wcoenen</dc:creator><comments>https://news.ycombinator.com/item?id=47392775</comments><guid isPermaLink="false">https://news.ycombinator.com/item?id=47392775</guid></item><item><title><![CDATA[New comment by wcoenen in "Glassworm is back: A new wave of invisible Unicode attacks hits repositories"]]></title><description><![CDATA[
<p>As far as I know, glyphs are determined by the font and rendering engine. They're not in the Unicode standard.</p>
]]></description><pubDate>Sun, 15 Mar 2026 18:50:53 +0000</pubDate><link>https://news.ycombinator.com/item?id=47390537</link><dc:creator>wcoenen</dc:creator><comments>https://news.ycombinator.com/item?id=47390537</comments><guid isPermaLink="false">https://news.ycombinator.com/item?id=47390537</guid></item><item><title><![CDATA[New comment by wcoenen in "Universal vaccine against respiratory infections and allergens"]]></title><description><![CDATA[
<p>I was thinking the same thing. Perhaps the trade-off made by evolution is about saving energy?<p>In that case it shouldn't be a problem to boost the innate immune system, as long as you have surplus calories to spend. But it could be something else entirely.</p>
]]></description><pubDate>Wed, 11 Mar 2026 07:08:02 +0000</pubDate><link>https://news.ycombinator.com/item?id=47332484</link><dc:creator>wcoenen</dc:creator><comments>https://news.ycombinator.com/item?id=47332484</comments><guid isPermaLink="false">https://news.ycombinator.com/item?id=47332484</guid></item><item><title><![CDATA[New comment by wcoenen in "Most of the US economy is in a recession"]]></title><description><![CDATA[
<p>There is not going to be any shortage of plastics in the medium term.<p>Shale oil and gas production in the US produces vast quantities of ethane as a byproduct. This ethane is cracked into ethylene, a feedstock for making plastic. There is an oversupply of the stuff.</p>
]]></description><pubDate>Mon, 09 Mar 2026 00:16:43 +0000</pubDate><link>https://news.ycombinator.com/item?id=47303182</link><dc:creator>wcoenen</dc:creator><comments>https://news.ycombinator.com/item?id=47303182</comments><guid isPermaLink="false">https://news.ycombinator.com/item?id=47303182</guid></item><item><title><![CDATA[New comment by wcoenen in "Tinnitus Is Connected to Sleep"]]></title><description><![CDATA[
<p>Thanks! I didn't know it was a known phenomenon. Now I know what to google.<p>My tinnitus is fortunately not super loud; it's only noticeable when it's relatively quiet, or I'm blocking sounds (with ear plugs, or noise cancelling headphones without input, etc.). So it's not like I habitually blast my ears with loud sine waves out of desperation. But I can imagine it may be different for other readers, so that's a good caveat.</p>
]]></description><pubDate>Sat, 07 Mar 2026 21:22:40 +0000</pubDate><link>https://news.ycombinator.com/item?id=47291600</link><dc:creator>wcoenen</dc:creator><comments>https://news.ycombinator.com/item?id=47291600</comments><guid isPermaLink="false">https://news.ycombinator.com/item?id=47291600</guid></item><item><title><![CDATA[New comment by wcoenen in "Tinnitus Is Connected to Sleep"]]></title><description><![CDATA[
<p>I can play a pure sine wave tone with a tone generator app, and dial the frequency up until it precisely matches my tinnitus. I originally did this just to determine that frequency.<p>But I noticed a side-effect: if I then turn off the tone generator, my tinnitus would disappear! Unfortunately that effect only lasts for a minute or less, so it is not really practical to get relief this way.</p>
]]></description><pubDate>Sat, 07 Mar 2026 15:09:14 +0000</pubDate><link>https://news.ycombinator.com/item?id=47288315</link><dc:creator>wcoenen</dc:creator><comments>https://news.ycombinator.com/item?id=47288315</comments><guid isPermaLink="false">https://news.ycombinator.com/item?id=47288315</guid></item><item><title><![CDATA[New comment by wcoenen in "What are the best coping mechanisms for AI Fatalism?"]]></title><description><![CDATA[
<p>Those "Thumping great Unix boxes" (or indeed even integrated circuits) didn't exist before the sixties. So it seems that technological revolutions do occur from time to time.</p>
]]></description><pubDate>Wed, 25 Feb 2026 14:54:37 +0000</pubDate><link>https://news.ycombinator.com/item?id=47152345</link><dc:creator>wcoenen</dc:creator><comments>https://news.ycombinator.com/item?id=47152345</comments><guid isPermaLink="false">https://news.ycombinator.com/item?id=47152345</guid></item><item><title><![CDATA[New comment by wcoenen in "Tesla registrations crash 17% in Europe as BEV market surges 14%"]]></title><description><![CDATA[
<p>EV batteries degrade nowhere near that fast.<p><a href="https://www.teslarati.com/tesla-battery-life-80-percent-capacity-840km-1-million-km/" rel="nofollow">https://www.teslarati.com/tesla-battery-life-80-percent-capa...</a></p>
]]></description><pubDate>Tue, 24 Feb 2026 19:30:27 +0000</pubDate><link>https://news.ycombinator.com/item?id=47141565</link><dc:creator>wcoenen</dc:creator><comments>https://news.ycombinator.com/item?id=47141565</comments><guid isPermaLink="false">https://news.ycombinator.com/item?id=47141565</guid></item><item><title><![CDATA[New comment by wcoenen in "CXMT has been offering DDR4 chips at about half the prevailing market rate"]]></title><description><![CDATA[
<p>As far as I understand, the "entity list" you are referring to is part of the "Export Administration Regulations", so it restricts sales from the US to restricted entities, not the other way around.</p>
]]></description><pubDate>Sat, 21 Feb 2026 19:40:12 +0000</pubDate><link>https://news.ycombinator.com/item?id=47103933</link><dc:creator>wcoenen</dc:creator><comments>https://news.ycombinator.com/item?id=47103933</comments><guid isPermaLink="false">https://news.ycombinator.com/item?id=47103933</guid></item><item><title><![CDATA[New comment by wcoenen in "The US is flirting with its first-ever population decline"]]></title><description><![CDATA[
<p>This comes up in every discussion about demographics. But counterintuitively, there are no examples of financial incentives actually fixing this problem.<p>For example, in 2022 Hungary was spending 6.2% of GDP on such incentives[1], but this only managed to bring total fertility rate up to about 1.6 [2].<p>It is the same everywhere else. The real reason fertility has declined since the sixties is because people have access to effective birth control. Nobody wants to be a baby factory.<p>[1] <a href="https://abouthungary.hu/news-in-brief/hungary-to-spend-6-2-of-gdp-on-family-support-measures-in-2022" rel="nofollow">https://abouthungary.hu/news-in-brief/hungary-to-spend-6-2-o...</a><p>[2] <a href="https://www.macrotrends.net/global-metrics/countries/hun/hungary/fertility-rate" rel="nofollow">https://www.macrotrends.net/global-metrics/countries/hun/hun...</a></p>
]]></description><pubDate>Tue, 10 Feb 2026 15:59:28 +0000</pubDate><link>https://news.ycombinator.com/item?id=46961616</link><dc:creator>wcoenen</dc:creator><comments>https://news.ycombinator.com/item?id=46961616</comments><guid isPermaLink="false">https://news.ycombinator.com/item?id=46961616</guid></item><item><title><![CDATA[New comment by wcoenen in "Claude Code is suddenly everywhere inside Microsoft"]]></title><description><![CDATA[
<p>Do you have "Get the latest updates as soon as they're available" enabled? This automatically installs preview releases, so you may unwittingly be doing QA for Microsoft.</p>
]]></description><pubDate>Mon, 02 Feb 2026 13:09:00 +0000</pubDate><link>https://news.ycombinator.com/item?id=46855613</link><dc:creator>wcoenen</dc:creator><comments>https://news.ycombinator.com/item?id=46855613</comments><guid isPermaLink="false">https://news.ycombinator.com/item?id=46855613</guid></item><item><title><![CDATA[New comment by wcoenen in "Claude Cowork exfiltrates files"]]></title><description><![CDATA[
<p>When LLMs process tokens, each token is first converted to an embedding vector. (This token to vectors mapping is learned during training.)<p>Since a token itself carries no information about whether it has "authority" or not, I'm proposing to inject this information in a reserved number in that embedding vector. This needs to be done both during post-training and inference. Think of it as adding color or flavor to a token, so that it is always very clear to the LLM what comes from the system prompt, what comes from the user, and what is random data.</p>
]]></description><pubDate>Thu, 15 Jan 2026 21:00:38 +0000</pubDate><link>https://news.ycombinator.com/item?id=46639247</link><dc:creator>wcoenen</dc:creator><comments>https://news.ycombinator.com/item?id=46639247</comments><guid isPermaLink="false">https://news.ycombinator.com/item?id=46639247</guid></item><item><title><![CDATA[New comment by wcoenen in "UK offshore wind prices come in 40% cheaper than gas in record auction"]]></title><description><![CDATA[
<p>The article talks about strike prices but doesn't provide much context.<p>The context: this is about bids from wind farm operators to win "contracts for difference" with the Low Carbon Contracts Company, an entity owned by the UK government. It's essentially a subsidy scheme where the wind farms can lock in a specific price per MWh for all the electricity they will produce over a certain period. But only if they bid low enough to be among the winners of the auction.<p><a href="https://en.wikipedia.org/wiki/Contracts_for_Difference_(UK_energy)" rel="nofollow">https://en.wikipedia.org/wiki/Contracts_for_Difference_(UK_e...</a></p>
]]></description><pubDate>Thu, 15 Jan 2026 20:35:38 +0000</pubDate><link>https://news.ycombinator.com/item?id=46638883</link><dc:creator>wcoenen</dc:creator><comments>https://news.ycombinator.com/item?id=46638883</comments><guid isPermaLink="false">https://news.ycombinator.com/item?id=46638883</guid></item><item><title><![CDATA[New comment by wcoenen in "Claude Cowork exfiltrates files"]]></title><description><![CDATA[
<p>> <i>you cannot prevent prompt injection</i><p>I wonder if might be possible by introducing a concept of "authority". Tokens are mapped to vectors in an embedding space, so one of the dimensions of that space could be reserved to represent authority.<p>For the system prompt, the authority value could be clamped to maximum (+1). For text directly from the user or files with important instructions, the authority value could be clamped to a slightly lower value, or maybe 0 because the model needs to be balance being helpful against refusing requests from a malicious user. For random untrusted text (e.g. downloaded from the internet by the agent), it would be set to the minimum value (-1).<p>The model could then be trained to fully respect or completely ignore instructions, based on the "authority" of the text. Presumably it could learn to do the right thing with enough examples.</p>
]]></description><pubDate>Wed, 14 Jan 2026 22:38:21 +0000</pubDate><link>https://news.ycombinator.com/item?id=46624868</link><dc:creator>wcoenen</dc:creator><comments>https://news.ycombinator.com/item?id=46624868</comments><guid isPermaLink="false">https://news.ycombinator.com/item?id=46624868</guid></item><item><title><![CDATA[New comment by wcoenen in "Efficient method to capture carbon dioxide from the atmosphere"]]></title><description><![CDATA[
<p>Citation for a 2018 study with submarine-qualified sailors: <a href="https://pubmed.ncbi.nlm.nih.gov/29789085/" rel="nofollow">https://pubmed.ncbi.nlm.nih.gov/29789085/</a></p>
]]></description><pubDate>Wed, 31 Dec 2025 18:13:23 +0000</pubDate><link>https://news.ycombinator.com/item?id=46446681</link><dc:creator>wcoenen</dc:creator><comments>https://news.ycombinator.com/item?id=46446681</comments><guid isPermaLink="false">https://news.ycombinator.com/item?id=46446681</guid></item><item><title><![CDATA[New comment by wcoenen in "Efficient method to capture carbon dioxide from the atmosphere"]]></title><description><![CDATA[
<p>> <i>Noticeable cognitive impairment starts in the 700-1000ppm range</i><p>The US navy failed to detect such effects in submarine crew, even at much higher levels like 10,000 ppm.<p>Another reason to be skeptical is that exhaled breath is 4% CO2 (40,000 ppm!). Therefore a few thousand extra ppm in the inhaled air should not make much of a difference to the homeostasis mechanisms in our bodies.</p>
]]></description><pubDate>Wed, 31 Dec 2025 16:26:20 +0000</pubDate><link>https://news.ycombinator.com/item?id=46445551</link><dc:creator>wcoenen</dc:creator><comments>https://news.ycombinator.com/item?id=46445551</comments><guid isPermaLink="false">https://news.ycombinator.com/item?id=46445551</guid></item><item><title><![CDATA[New comment by wcoenen in "Helldivers 2 on-disk size 85% reduction"]]></title><description><![CDATA[
<p>> <i>But if someone ever got closer to filling up the disk in the past, the chances of contiguous gigabytes are much lower.</i><p>By default, Windows automatically defragments filesystems weekly if necessary. It can be configured in the "defragment and optimize drives" dialog.</p>
]]></description><pubDate>Thu, 11 Dec 2025 12:35:02 +0000</pubDate><link>https://news.ycombinator.com/item?id=46230621</link><dc:creator>wcoenen</dc:creator><comments>https://news.ycombinator.com/item?id=46230621</comments><guid isPermaLink="false">https://news.ycombinator.com/item?id=46230621</guid></item><item><title><![CDATA[New comment by wcoenen in "Principles of Slack Maximalism"]]></title><description><![CDATA[
<p>Meanwhile it feels like half my colleagues don't understand the difference between starting a new Teams conversation ("thread" in Slack), or replying to an existing one. And there's no way to move a message that was posted in the wrong conversation. AFAIK it's the same with Slack threads.<p>Getting people to post in the "correct" channel faces similar challenges.<p>Imagine the chaos that would result if we ran everything through Teams.</p>
]]></description><pubDate>Sun, 07 Dec 2025 13:19:40 +0000</pubDate><link>https://news.ycombinator.com/item?id=46181483</link><dc:creator>wcoenen</dc:creator><comments>https://news.ycombinator.com/item?id=46181483</comments><guid isPermaLink="false">https://news.ycombinator.com/item?id=46181483</guid></item></channel></rss>