• A Twitter thread debated the practicality of space-elevator alternatives: tidally-locked tethers and rotovators must continually restore rotational momentum; electrodynamic tethers that push current through long conductors in Earth’s magnetic field were proposed as a propellant-free solution, while orbital rings made of counter-rotating satellites with magnetic coils were sketched as an early-stage concept.

• muurkha derived that a spinning tether launching a payload at velocity v experiences exactly twice the centripetal acceleration of a linear mass driver of the same radius, highlighting g-force limits even for “dumb” masses, and recalled childhood whip-like multi-stage tethers that can reach supersonic tip speeds.

• Ned Seeman, pioneer of DNA nanotechnology, was noted to have passed away; concurrently, two independent teams published parallel “molecular ticker tape” preprints (protein-based and Boyden-style) that record cellular histories as optically readable self-assembling chains, and a new preprint on astrocyte computation via calcium waves was also shared.

• juri_ described progress on hslice, an open-source 3-D printer slicer written in Haskell that uses projective geometric algebra (PGA 2,0,1*) and property-based testing (QuickCheck) to achieve near-linear scaling on 56-thread hardware; the engine will expose slicing primitives to an embedded SCAD language so users can script custom slicing strategies.

• Links collected: Roswell-biological-uap essay (aseq.substack.com), tethers.com historical papers via Wayback, William Kamkwamba’s Malawian innovation center (movingwindmills.org), Shamir-secret-sharing on paper (github.com/roconnor-blockstream/SSS32), and Amir Aghaei’s MIT computational-fabrication page.