<?xml version="1.0" encoding="UTF-8"?><rss version="2.0"><channel><title>Mean Free Path</title><description>Essays on vacuum, frontier physics, and the machines that make the impossible routine. By Pierre F. Ribault.</description><link>https://pierreribault.com/</link><item><title>The Better Ceramic</title><link>https://pierreribault.com/essays/the-better-ceramic/</link><guid isPermaLink="true">https://pierreribault.com/essays/the-better-ceramic/</guid><description>What a material costs once it leaves the datasheet.</description><pubDate>Thu, 11 Jun 2026 00:00:00 GMT</pubDate></item><item><title>The Arc</title><link>https://pierreribault.com/essays/the-arc/</link><guid isPermaLink="true">https://pierreribault.com/essays/the-arc/</guid><description>The one failure a tube, an accelerator, and a fusion magnet all share, and the craft that keeps it away.</description><pubDate>Tue, 02 Jun 2026 00:00:00 GMT</pubDate></item><item><title>Everything Outgasses</title><link>https://pierreribault.com/essays/everything-outgasses/</link><guid isPermaLink="true">https://pierreribault.com/essays/everything-outgasses/</guid><description>A law that does not care whether you are building an X-ray tube, an accelerator, or a star.</description><pubDate>Sun, 31 May 2026 00:00:00 GMT</pubDate></item><item><title>The Floor Under the Fab</title><link>https://pierreribault.com/essays/the-vacuum-lock/</link><guid isPermaLink="true">https://pierreribault.com/essays/the-vacuum-lock/</guid><description>The chip war is fought over things everyone can name. Under all of them sits one layer nobody does.</description><pubDate>Tue, 26 May 2026 00:00:00 GMT</pubDate></item></channel></rss>