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A successful Japanese trial of a ramjet engine designed for Mach‑5 aircraft (news.ycombinator.com)

2026-05-25 | by Alan Bradley | get Mach 5 Jet Model → | tags: ramjet, mach-5 aircraft, hypersonic jets

Japan's New Hypersonic Engine Could Make 2-Hour Flights to the US a Reality (news.ycombinator.com)

2026-05-25 | by Alan Bradley | get Hypersonic Flight Model → | tags: ramjet, hypersonic jets, japan

The sigmoids won't save you (news.ycombinator.com)

2026-05-15 | by Scott Alexander | get Sigmoid Activation Function Poster → | tags: sigmoid, ai capabilities, exponential growth

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