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Prototypes tested in India show promise as a low-cost, natural filtration option. The interiors of nonflowering trees such as pine and ginkgo contain sapwood lined with straw-like conduits known as xylem, which draw water up through a tree’s trunk and branches. Xylem conduits are interconnected via ...
The new terahertz camera device provides greater sensitivity and speed than previous versions, and could be used for industrial inspection, airport security, and communications. Terahertz radiation, also known as submillimeter radiation, has wavelengths that lie between those of microwaves and visib...
Low-Cost and Eco-Friendly: UCLA Engineers Develop Innovative New Building Cooling Technology
(scitechdaily.com)
A low-cost method uses common building materials that absorb or radiate heat to regulate temperature. As global temperatures increase, the demand for sustainable cooling solutions is also on the rise. A team of researchers from UCLA and their collaborators have developed a cost-effective and scalabl...
https://letsencrypt.org/2025/01/22/ending-expiration-emails/<p>Quote:<p><i>> Providing expiration notifications costs Let’s Encrypt tens of thousands of dollars per year, money that we believe can be better spent on other aspects of our infrastructure.</i><p>I&#...
Hi HN!<p>We are a group of YC founders sick of the hiring status quo. We're launching Canteen, a recruiting platform that makes hiring top technical talent ~10x faster, at a fraction of the cost of traditional agencies.<p>Instead of wrangling recruiters, you just tell Cursor/Claude:<p>“cur...