Builder Tom Stanton has created a trebuchet that launches a projectile past the speed of sound, relying solely on gravitational potential energy. The design breaks a longstanding assumption that such devices cannot reach supersonic speeds. It marks a notable engineering milestone in DIY physics and projectile mechanics.

The author recounts their attempt to build a custom harness for AI coding tasks, but discovered that OpenAI's Codex Desktop won out in performance and features. This highlights how ready-made AI tools are increasingly surpassing bespoke solutions, a key consideration for developers.

A 1978 essay resurfaces featuring scientist and philosopher John C. Lilly, who speculated about non-biological "solid state" intelligence surpassing and potentially eliminating humanity. The piece offers an early, prescient discussion of artificial intelligence as an existential threat, and is now shared on Hacker News as a historical curiosity.

The author publicly admits fault for events that contributed to a difficult period. They take responsibility for their actions and reflect on the mistakes made. This matters because accountability is essential for regaining trust and moving forward.

A user shares their experience restoring a four-year-old reMarkable 2 e-ink tablet, likely addressing battery, software, or performance issues. The post highlights the repairability and longevity of niche devices. It matters for owners of older hardware considering upgrades or fixes.